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Are Horses American

author
James Smith
• Sunday, 29 November, 2020
• 79 min read

Horses running at a ranch in Texas Horses have been a crucial component of American life and culture since the founding of the nation. In 2008, there were an estimated 9.2 million horses in the United States, with 4.6 million citizens involved in businesses related to horses.

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Contents

Notably, there are about 82,000 feral horses that roam freely in the wild in certain parts of the country, mostly in the Western United States. While genus Equus, of which the horse is a member, originally evolved in North America, the horse became extinct on the continent approximately 8,000–12,000 years ago.

In 1493, on Christopher Columbus' second voyage to the Americas, Spanish horses, representing E. Catullus, were brought back to North America, first to the Virgin Islands ; they were reintroduced to the continental mainland by Hernán Cortés in 1519. From early Spanish imports to Mexico and Florida, horses moved north, supplemented by later imports to the east and west coasts brought by British, French, and other European colonists.

Native peoples of the Americas quickly obtained horses and developed their own horse culture that was largely distinct from European traditions. Horses remained an integral part of American rural and urban life until the 20th century, when the widespread emergence of mechanization caused their use for industrial, economic, and transportation purposes to decline.

Modern use of the horse in the United States is primarily for recreation and entertainment, though some horses are still used for specialized tasks. A 2005 genetic study of fossils found evidence for three genetically divergent equip lineages in Pleistocene North and South America.

Recent studies suggest all North American fossils of caballine-type horses, including both the domesticated horse and Przewalski's horse, belong to the same species: E. ferns. Remains attributed to a variety of species and lumped as New World stilt-legged horses belong to a second species that was endemic to North America, now called Haringtonhippus Francisco.

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Digs in western Canada have unearthed clear evidence horses existed in North America as recently as 12,000 years ago. Other studies produced evidence that horses in the Americas existed until 8,000–10,000 years ago.

Equine in North America ultimately became extinct, along with most of the other New World megafauna during the Quaternary extinction event during the Pleistocene-Holocene transition between 15,000 and 10,000 years ago. Given the suddenness of the event and because these mammals had been flourishing for millions of years previously, something unusual must have happened.

The first main hypothesis attributes extinction to climate change. For example, in Alaska, beginning approximately 12,500 years ago, the grasses characteristic of a steppe ecosystem gave way to shrub tundra, which was covered with unpalatable plants.

However, it has also been proposed that the steppe-tundra vegetation transition in Bering may have been a consequence, rather than a cause, of the extinction of megafaunal grazers. The other hypothesis suggests extinction was linked to overexploitation of native prey by newly arrived humans.

The extinctions were roughly simultaneous with the end of the most recent glacial advance and the appearance of the big game-hunting Clovis culture. Several studies have indicated humans probably arrived in Alaska at the same time or shortly before the local extinction of horses.

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Horses returned to the Americas thousands of years later, well after domestication of the horse, beginning with Christopher Columbus in 1493. These were Iberian horses first brought to Hispaniola and later to Panama, Mexico, Brazil, Peru, Argentina, and, in 1538, Florida.

The first horses to return to the main continent were 16 specifically identified horses brought by Hernán Cortés in 1519. Subsequent explorers, such as Coronado and De Soto brought ever-larger numbers, some from Spain and others from breeding establishments set up by the Spanish in the Caribbean.

The first imports were smaller animals suited to the size restrictions imposed by ships. Starting in the mid-19th century, larger draft horses began to be imported, and by the 1880s, thousands had arrived.

Formal horse racing in the United States dates back to 1665, when a racecourse was opened on the Hempstead Plains near Salisbury in what is now Nassau County, New York. There are multiple theories for how Native American people obtained horses from the Spanish, but early capture of stray horses during the 16th century was unlikely due to the need to simultaneously acquire the skills to ride and manage them.

It is unlikely that Native people obtained horses in significant numbers to become a horse culture any earlier than 1630–1650. From a trade center in the Santa Fe, New Mexico area, the horse spread slowly north.

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The Comanche people were thought to be among the first tribes to obtain horses and use them successfully. By 1742, there were reports by white explorers that the Crow and Blackfoot people had horses, and probably had them for a considerable time.

The horse became an integral part of the lives and culture of Native Americans, especially the Plains Indians, who viewed them as a source of wealth and used them for hunting, travel, and warfare. In the 19th century, horses were used for many jobs.

In the west, they were ridden by cowboys for handling cattle on the large ranches of the region and on cattle drives. In some cases, their labor was deemed more efficient than using steam-powered equipment to power certain types of mechanized equipment.

At the same time, the maltreatment of horses in cities such as New York, where over 130,000 horses were used, led to the creation of the first ASPCA in 1866. In the 19th century, the Standard bred breed of harness racing horse developed in the United States, and many thoroughbred horse races were established.

Horse-drawn sightseeing bus, 1942At the start of the 20th century, the United States Department of Agriculture began to establish breeding farms for research, to preserve American horse breeds, and to develop horses for military and agricultural purposes. However, after the end of World War I, the increased use of mechanized transportation resulted in a decline in the horse populations, with a 1926 report noting horse prices were the lowest they had been in 60 years.

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In 1912, the United States and Russia held the most horses in the world, with the U.S. having the second-highest number. There were an estimated 20 million horses in March 1915 in the United States.

But as increased mechanization reduced the need for horses as working animals, populations declined. A USDA census in 1959 showed the horse population had dropped to 4.5 million.

Numbers began to rebound somewhat, and by 1968 there were about 7 million horses, mostly used for riding. ^ One hypothesis posits that horses survived the ice age in North America, but no physical evidence has been found to substantiate this claim.

“Evolution, systematic, and paleogeography of Pleistocene horses in the New World: a molecular perspective”. “Ancient DNA Clarifies the Evolutionary History of American Late Pleistocene Equips”.

^ Hartman, Peter D; Paula, Grant D; Machete, Ross DE; Scott, Eric; Cahill, James A; Choose, Brianna K; Knapp, Joshua D; Stiller, Mathias; Woollier, Matthew J; Orlando, Ludovic; South on, John (November 28, 2017). “A new genus of horse from Pleistocene North America”.

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“Rapid body size decline in Alaskan Pleistocene horses before extinction”. “Steppe-tundra transition: a herbivore-driven biome shift at the end of the Pleistocene”.

“A calendar chronology for Pleistocene mammoth and horse extinction in North America based on Bayesian radiocarbon calibration”. ^ Slow, Andrew; Roberts, David; Robert, Karen (May 9, 2006).

“On the Pleistocene extinctions of Alaskan mammoths and horses ". Proceedings of the National Academy of Sciences of the United States of America (19 ed.).

“New carbon dates link climatic change with human colonization and Pleistocene extinctions”. “Iberian Origins of New World Horse Breeds”.

Report of the Chief of the Bureau of Animal Industry, United States Department of Agriculture. Horses in Society: A Story of Animal Breeding and Marketing, 1800–1920.

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The last prehistoric North American horses died out between 13,000 and 11,000 years ago, at the end of the Pleistocene, but by then Equus had spread to Asia, Europe, and Africa. In any case the domesticated horse probably did not arise at a single place and time, but was bred from several wild varieties by Eurasian herders.

In recent years, molecular biology has provided new tools for working out the relationships among species and subspecies of equips. For example, based on mutation rates for mitochondrial DNA (mt DNA) Ann Forster, of the Zoological Institute at the University of Helsinki, has estimated that E. Catullus originated approximately 1.7 million years ago in North America.

Her examination of E. samba mt DNA (preserved in the Alaskan permafrost) has revealed that the species is genetically equivalent to E. Catullus. That conclusion has been further supported by Michael Forfeited, of the Department of Evolutionary Genetics at the Max Planck Institute in Leipzig, Germany, who has found that the variation fell within that of modern horses.

Then surplus animals were released during the 1990s and now repopulate a portion of their native range in Mongolia and China. The wild horse in the United States is generally labeled non-native by most federal and state agencies dealing with wildlife management, whose legal mandate is usually to protect native wildlife and prevent non-native species from having ecologically harmful effects.

Jay F. Kirkpatrick, who earned a Ph.D. in reproductive physiology from the College of Veterinary Medicine at Cornell University, has studied fertility control for wild horses. Patricia M. Fabio, a research fellow at the Science and Conservation Center, earned her Ph.D. in environmental history from Texas A&M University.

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Her interests include reproductive physiology, the monitoring of wild horse ranges, and the evolution of equips. Horse Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalian Order: Perissodactyla Family: Equine Genus: Equus Species: Subspecies: Trinomial name Equus ferns Catullus Synonyms The horse (Equus ferns Catullus) is one of two extant subspecies of Equus ferns.

It is an odd-toed ungulate mammal belonging to the taxonomic family Equine. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature, Phipps, into the large, single-toed animal of today.

Horses in the subspecies Catullus are domesticated, although some domesticated populations live in the wild as feral horses. There is an extensive, specialized vocabulary used to describe equine-related concepts, covering everything from anatomy to life stages, size, colors, markings, breeds, locomotion, and behavior.

Horses are adapted to run, allowing them to quickly escape predators, possessing an excellent sense of balance and a strong fight-or-flight response. Related to this need to flee from predators in the wild is an unusual trait: horses are able to sleep both standing up and lying down, with younger horses tending to sleep significantly more than adults.

Female horses, called mares, carry their young for approximately 11 months, and a young horse, called a foal, can stand and run shortly following birth. Most domesticated horses begin training under a saddle or in a harness between the ages of two and four.

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They reach full adult development by age five, and have an average lifespan of between 25 and 30 years. Horse breeds are loosely divided into three categories based on general temperament: spirited “hot bloods” with speed and endurance; “cold bloods”, such as draft horses and some ponies, suitable for slow, heavy work; and warm bloods “, developed from crosses between hot bloods and cold bloods, often focusing on creating breeds for specific riding purposes, particularly in Europe.

There are more than 300 breeds of horse in the world today, developed for many uses. Horses and humans interact in a wide variety of sport competitions and non-competitive recreational pursuits, as well as in working activities such as police work, agriculture, entertainment, and therapy.

Horses were historically used in warfare, from which a wide variety of riding and driving techniques developed, using many styles of equipment and methods of control. Many products are derived from horses, including meat, milk, hide, hair, bone, and pharmaceuticals extracted from the urine of pregnant mares.

Humans provide domesticated horses with food, water, and shelter, as well as attention from specialists such as veterinarians and farriers. Specific terms and specialized language are used to describe equine anatomy, different life stages, and colors and breeds.

Depending on breed, management and environment, the modern domestic horse has a life expectancy of 25 to 30 years. Uncommonly, a few animals live into their 40s and, occasionally, beyond.

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The oldest verifiable record was Old Billy “, a 19th-century horse that lived to the age of 62. In modern times, Sugar Puff, who had been listed in Guinness World Records as the world's oldest living pony, died in 2007 at age 56.

Regardless of a horse or pony's actual birthdate, for most competition purposes a year is added to its age each January 1 of each year in the Northern Hemisphere and each August 1 in the Southern Hemisphere. The exception is in endurance riding, where the minimum age to compete is based on the animal's actual calendar age.

Most domesticated foals are weaned at five to seven months of age, although foals can be weaned at four months with no adverse physical effects. Colt : A male horse under the age of four.

A common terminology error is to call any young horse a “colt”, when the term actually only refers to young male horses. Filly : A female horse under the age of four.

The term “horse” is sometimes used colloquially to refer specifically to a stallion. Gelding : A castrated male horse of any age.

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In horse racing, these definitions may differ: For example, in the British Isles, Thoroughbred horse racing defines colts and fillies as less than five years old. However, Australian Thoroughbred racing defines colts and fillies as less than four years old.

The height of horses is measured at the highest point of the withers, where the neck meets the back. This point is used because it is a stable point of the anatomy, unlike the head or neck, which move up and down in relation to the body of the horse.

In English-speaking countries, the height of horses is often stated in units of hands and inches: one hand is equal to 4 inches (101.6 mm). The height is expressed as the number of full hands, followed by a point, then the number of additional inches, and ending with the abbreviation “h” or “HH” (for “hands high”).

Light riding horses usually range in height from 14 to 16 hands (56 to 64 inches, 142 to 163 cm) and can weigh from 380 to 550 kilograms (840 to 1,210 lb). Larger riding horses usually start at about 15.2 hands (62 inches, 157 cm) and often are as tall as 17 hands (68 inches, 173 cm), weighing from 500 to 600 kilograms (1,100 to 1,320 lb).

Heavy or draft horses are usually at least 16 hands (64 inches, 163 cm) high and can be as tall as 18 hands (72 inches, 183 cm) high. He stood 21.2 1 4 hands (86.25 inches, 219 cm) high and his peak weight was estimated at 1,524 kilograms (3,360 lb).

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The current record holder for the world's smallest horse is Tumbling, a fully mature miniature horse affected by dwarfism. She is 17 in (43 cm) tall and weighs 57 lb (26 kg).

The distinction between a horse and pony is commonly drawn on the basis of height, especially for competition purposes. However, height alone is not dispositive; the difference between horses and ponies may also include aspects of phenotype, including conformation and temperament.

The traditional standard for height of a horse or a pony at maturity is 14.2 hands (58 inches, 147 cm). An animal 14.2 h or over is usually considered to be a horse and one less than 14.2 h a pony, but there are many exceptions to the traditional standard.

In Australia, ponies are considered to be those under 14 hands (56 inches, 142 cm). For competition in the Western division of the United States Equestrian Federation, the cutoff is 14.1 hands (57 inches, 145 cm).

The International Federation for Equestrian Sports, the world governing body for horse sport, uses metric measurements and defines a pony as being any horse measuring less than 148 centimeters (58.27 in) at the withers without shoes, which is just over 14.2 h, and 149 centimeters (58.66 in), or just over 14.2 1 2 h, with shoes. Height is not the sole criterion for distinguishing horses from ponies.

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Breed registries for horses that typically produce individuals both under and over 14.2 h consider all animals of that breed to be horses regardless of their height. Conversely, some pony breeds may have features in common with horses, and individual animals may occasionally mature at over 14.2 h, but are still considered to be ponies.

Ponies often exhibit thicker manes, tails, and overall coat. They also have proportionally shorter legs, wider barrels, heavier bone, shorter and thicker necks, and short heads with broad foreheads.

They may have calmer temperaments than horses and also a high level of intelligence that may or may not be used to cooperate with human handlers. Conversely, breeds such as the Flagella and other miniature horses, which can be no taller than 30 inches (76 cm), are classified by their registries as very small horses, not ponies.

Bay (left) and chestnut (sometimes called “sorrel”) are two of the most common coat colors, seen in almost all breeds. Horses exhibit a diverse array of coat colors and distinctive markings, described by a specialized vocabulary.

Often, a horse is classified first by its coat color, before breed or sex. Horses of the same color may be distinguished from one another by white markings, which, along with various spotting patterns, are inherited separately from coat color.

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Many genes that create horse coat colors and patterns have been identified. Current genetic tests can identify at least 13 different alleles influencing coat color, and research continues to discover new genes linked to specific traits.

The basic coat colors of chestnut and black are determined by the gene controlled by the Melanocortin 1 receptor, also known as the “extension gene” or “red factor,” as its recessive form is “red” (chestnut) and its dominant form is black. Additional genes control suppression of black color to point coloration that results in a bay, spotting patterns such as pinto or leopard, dilution genes such as palomino or dun, as well as graying, and all the other factors that create the many possible coat colors found in horses.

Grays are born a darker shade, get lighter as they age, but usually keep black skin underneath their white hair coat (except pink skin under white markings). The only horses properly called white are born with a predominantly white hair coat and pink skin, a fairly rare occurrence.

Different and unrelated genetic factors can produce white coat colors in horses, including several alleles of dominant white and the sabino-1 gene. However, there are no albino horses, defined as having both pink skin and red eyes.

Gestation lasts approximately 340 days, with an average range 320–370 days, and usually results in one foal ; twins are rare. Horses are a precocity species, and foals are capable of standing and running within a short time following birth.

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The estrous cycle of a mare occurs roughly every 19–22 days and occurs from early spring into autumn. Foals are generally weaned from their mothers between four and six months of age.

Horses, particularly colts, sometimes are physically capable of reproduction at about 18 months, but domesticated horses are rarely allowed to breed before the age of three, especially females. Horses four years old are considered mature, although the skeleton normally continues to develop until the age of six; maturation also depends on the horse's size, breed, sex, and quality of care.

These plates convert after the other parts of the bones, and are crucial to development. Depending on maturity, breed, and work expected, horses are usually put under saddle and trained to be ridden between the ages of two and four.

Although Thoroughbred race horses are put on the track as young as the age of two in some countries, horses specifically bred for sports such as dressage are generally not put under saddle until they are three or four years old, because their bones and muscles are not solidly developed. For endurance riding competition, horses are not deemed mature enough to compete until they are a full 60 calendar months (five years) old.

The horse's four legs and hooves are also unique structures. Their leg bones are proportioned differently from those of a human.

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For example, the body part that is called a horse's “knee” is actually made up of the carpal bones that correspond to the human wrist. Similarly, the hock contains bones equivalent to those in the human ankle and heel.

The lower leg bones of a horse correspond to the bones of the human hand or foot, and the fetlock (incorrectly called the “ankle”) is actually the proximal sesamoid bones between the cannon bones (a single equivalent to the human metacarpal or metatarsal bones) and the proximal phalanges, located where one finds the “knuckles” of a human. A horse also has no muscles in its legs below the knees and hocks, only skin, hair, bone, tendons, ligaments, cartilage, and the assorted specialized tissues that make up the hoof.

Hooves The critical importance of the feet and legs is summed up by the traditional adage, “no foot, no horse”. The horse hoof begins with the distal phalanges, the equivalent of the human fingertip or tip of the toe, surrounded by cartilage and other specialized, blood-rich soft tissues such as the laminae.

The exterior hoof wall and horn of the sole is made of keratin, the same material as a human fingernail. The end result is that a horse, weighing on average 500 kilograms (1,100 lb), travels on the same bones as would a human on tiptoe.

For the protection of the hoof under certain conditions, some horses have horseshoes placed on their feet by a professional farrier. The hoof continually grows, and in most domesticated horses needs to be trimmed (and horseshoes reset, if used) every five to eight weeks, though the hooves of horses in the wild wear down and regrow at a rate suitable for their terrain.

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In an adult horse, there are 12 incisors at the front of the mouth, adapted to biting off the grass or other vegetation. There are 24 teeth adapted for chewing, the premolars and molars, at the back of the mouth.

Stallions and geldings have four additional teeth just behind the incisors, a type of canine teeth called “tushes”. Some horses, both male and female, will also develop one to four very small vestigial teeth in front of the molars, known as “wolf” teeth, which are generally removed because they can interfere with the bit.

There is an empty interdental space between the incisors and the molars where the bit rests directly on the gums, or “bars” of the horse's mouth when the horse is bridled. An estimate of a horse's age can be made from looking at its teeth.

The teeth continue to erupt throughout life and are worn down by grazing. Therefore, the incisors show changes as the horse ages; they develop a distinct wear pattern, changes in tooth shape, and changes in the angle at which the chewing surfaces meet.

This allows a very rough estimate of a horse's age, although diet and veterinary care can also affect the rate of tooth wear. Digestion Horses are herbivores with a digestive system adapted to a forage diet of grasses and other plant material, consumed steadily throughout the day.

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Therefore, compared to humans, they have a relatively small stomach but very long intestines to facilitate a steady flow of nutrients. A 450-kilogram (990 lb) horse will eat 7 to 11 kilograms (15 to 24 lb) of food per day and, under normal use, drink 38 to 45 liters (8.4 to 9.9 imp gal; 10 to 12 US gal) of water.

Horses are not ruminants, they have only one stomach, like humans, but unlike humans, they can utilize cellulose, a major component of grass. Cellulose fermentation by symbiotic bacteria occurs in the cecum, or “water gut”, which food goes through before reaching the large intestine.

Horses cannot vomit, so digestion problems can quickly cause colic, a leading cause of death. Senses The horses senses are based on their status as prey animals, where they must be aware of their surroundings at all times.

Their sense of smell, while much better than that of humans, is not quite as good as that of a dog. It is believed to play a key role in the social interactions of horses as well as detecting other key scents in the environment.

The first system is in the nostrils and nasal cavity, which analyze a wide range of odors. These have a separate nerve pathway to the brain and appear to primarily analyze pheromones.

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A horse's hearing is good, and the Penna of each ear can rotate up to 180°, giving the potential for 360° hearing without having to move the head. Noise impacts the behavior of horses and certain kinds of noise may contribute to stress: A 2013 study in the UK indicated that stabled horses were calmest in a quiet setting, or if listening to country or classical music, but displayed signs of nervousness when listening to jazz or rock music.

This study also recommended keeping music under a volume of 21 decibels. An Australian study found that stabled racehorses listening to talk radio had a higher rate of gastric ulcers than horses listening to music, and racehorses stabled where a radio was played had a higher overall rate of ulceration than horses stabled where there was no radio playing.

Horses are able to sense contact as subtle as an insect landing anywhere on the body. Horses have an advanced sense of taste, which allows them to sort through fodder and choose what they would most like to eat, and their prehensile lips can easily sort even small grains.

Horses generally will not eat poisonous plants, however, there are exceptions; horses will occasionally eat toxic amounts of poisonous plants even when there is adequate healthy food. All horses move naturally with four basic gaits : the four-beat walk, which averages 6.4 kilometers per hour (4.0 mph); the two-beat trot or jog at 13 to 19 kilometers per hour (8.1 to 11.8 mph) (faster for harness racing horses); the canter or lope, a three-beat gait that is 19 to 24 kilometers per hour (12 to 15 mph); and the gallop.

The gallop averages 40 to 48 kilometers per hour (25 to 30 mph), but the world record for a horse galloping over a short, sprint distance is 70.76 kilometers per hour (43.97 mph). Besides these basic gaits, some horses perform a two-beat pace, instead of the trot.

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There also are several four-beat ambling gaits that are approximately the speed of a trot or pace, though smoother to ride. These include the lateral rack, running walk, and told as well as the diagonal fox trot.

Horses are prey animals with a strong fight-or-flight response. Their first reaction to a threat is to startle and usually flee, although they will stand their ground and defend themselves when flight is impossible or if their young are threatened.

They also tend to be curious; when startled, they will often hesitate an instant to ascertain the cause of their fright, and may not always flee from something that they perceive as non-threatening. Most light horse riding breeds were developed for speed, agility, alertness and endurance; natural qualities that extend from their wild ancestors.

Horses are herd animals, with a clear hierarchy of rank, led by a dominant individual, usually a mare. They are also social creatures that are able to form companionship attachments to their own species and to other animals, including humans.

They communicate in various ways, including vocalizations such as nickering or whinnying, mutual grooming, and body language. However, when confined with insufficient companionship, exercise, or stimulation, individuals may develop stable vices, an assortment of bad habits, mostly stereotypes of psychological origin, that include wood chewing, wall kicking, “weaving” (rocking back and forth), and other problems.

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Intelligence and learning Domesticated horses may face greater mental challenges than wild horses, because they live in artificial environments that prevent instinctive behavior whilst also learning tasks that are not natural. One trainer believes that “intelligent” horses are reflections of intelligent trainers who effectively use response conditioning techniques and positive reinforcement to train in the style that best fits with an individual animal's natural inclinations.

Temperament Horses are mammals, and as such are warm-blooded, or endothermic creatures, as opposed to cold-blooded, or poikilothermic animals. However, these words have developed a separate meaning in the context of equine terminology, used to describe temperament, not body temperature.

For example, the “hot-bloods”, such as many race horses, exhibit more sensitivity and energy, while the “cold-bloods”, such as most draft breeds, are quieter and calmer. Illustration of assorted breeds; slim, light hot bloods, medium-sized warm bloods and draft and pony-type cold blood breeds”Hot blooded” breeds include oriental horses such as the Akhal-Teke, Arabian horse, Barb and now-extinct Turbofan horse, as well as the Thoroughbred, a breed developed in England from the older oriental breeds.

Hot bloods tend to be spirited, bold, and learn quickly. The original oriental breeds were brought to Europe from the Middle East and North Africa when European breeders wished to infuse these traits into racing and light cavalry horses.

Muscular, heavy draft horses are known as “cold bloods”, as they are bred not only for strength, but also to have the calm, patient temperament needed to pull a plow or a heavy carriage full of people. Well-known draft breeds include the Belgian and the Clydesdale.

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Some, like the Percheron, are lighter and livelier, developed to pull carriages or to plow large fields in drier climates. Others, such as the Shire, are slower and more powerful, bred to plow fields with heavy, clay-based soils.

“ Warm blood breeds, such as the Takeover or Hanoverian, developed when European carriage and war horses were crossed with Arabians or Thoroughbreds, producing a riding horse with more refinement than a draft horse, but greater size and milder temperament than a lighter breed. Certain pony breeds with warm blood characteristics have been developed for smaller riders.

Sleep patterns When horses lie down to sleep, others in the herd remain standing, awake or in a light doze, keeping watch. In an adaptation from life in the wild, horses are able to enter light sleep by using a stay apparatus in their legs, allowing them to doze without collapsing.

A horse kept alone will not sleep well because its instincts are to keep a constant eye out for danger. Unlike humans, horses do not sleep in a solid, unbroken period of time, but take many short periods of rest.

Horses spend four to fifteen hours a day in standing rest, and from a few minutes to several hours lying down. Total sleep time in a 24-hour period may range from several minutes to a couple of hours, mostly in short intervals of about 15 minutes each.

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They only have to lie down for an hour or two every few days to meet their minimum REM sleep requirements. However, if a horse is never allowed to lie down, after several days it will become sleep-deprived, and in rare cases may suddenly collapse as it involuntarily slips into REM sleep while still standing.

This condition differs from narcolepsy, although horses may also suffer from that disorder. From left to right: Size development, biometrical changes in the cranium, reduction of toes (left forefoot)The horse adapted to survive in areas of wide-open terrain with sparse vegetation, surviving in an ecosystem where other large grazing animals, especially ruminants, could not.

The earliest known member of the family Equine was the Hyracotherium, which lived between 45 and 55 million years ago, during the Eocene period. The extra toe on the front feet soon disappeared with the Mesohippus, which lived 32 to 37 million years ago.

Over time, the extra side toes shrank in size until they vanished. All that remains of them in modern horses is a set of small vestigial bones on the leg below the knee, known informally as splint bones.

Their legs also lengthened as their toes disappeared until they were a hooked animal capable of running at great speed. By about 5 million years ago, the modern Equus had evolved.

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Equip teeth also evolved from browsing on soft, tropical plants to adapt to browsing of drier plant material, then to grazing of tougher plains grasses. Thus, photo- horses changed from leaf-eating forest-dwellers to grass-eating inhabitants of semi-arid regions worldwide, including the steppes of Eurasia and the Great Plains of North America.

By about 15,000 years ago, Equus ferns was a widespread Arctic species. Horse bones from this time period, the late Pleistocene, are found in Europe, Eurasia, Bering, and North America.

Yet between 10,000 and 7,600 years ago, the horse became extinct in North America and rare elsewhere. The reasons for this extinction are not fully known, but one theory notes that extinction in North America paralleled human arrival.

Another theory points to climate change, noting that approximately 12,500 years ago, the grasses characteristic of a steppe ecosystem gave way to shrub tundra, which was covered with unpalatable plants. A small herd of Przewalski's Horses A truly wild horse is a species or subspecies with no ancestors that were ever domesticated.

Therefore, most “wild” horses today are actually feral horses, animals that escaped or were turned loose from domestic herds and the descendants of those animals. The Przewalski's horse (Equus ferns przewalskii), named after the Russian explorer Nikolai Przhevalsky, is a rare Asian animal.

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It is also known as the Mongolian wild horse; Mongolian people know it as the take, and the Kerry people call it a airbag. The subspecies was presumed extinct in the wild between 1969 and 1992, while a small breeding population survived in zoos around the world.

In 1992, it was reestablished in the wild due to the conservation efforts of numerous zoos. Today, a small wild breeding population exists in Mongolia.

There are additional animals still maintained at zoos throughout the world. The Tarzan or European wild horse (Equus ferus) was found in Europe and much of Asia.

It survived into the historical era, but became extinct in 1909, when the last captive died in a Russian zoo. Attempts to have been made to recreate the Tarzan, which resulted in horses with outward physical similarities, but nonetheless descended from domesticated ancestors and not true wild horses.

Periodically, populations of horses in isolated areas are speculated to be relict populations of wild horses, but generally have been proven to be feral or domestic. For example, the Roche horse of Tibet was proposed as such, but testing did not reveal genetic differences from domesticated horses.

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Similarly, the Sorrier of Portugal was proposed as a direct descendant of the Tarzan based on shared characteristics, but genetic studies have shown that the Sorrier is more closely related to other horse breeds and that the outward similarity is an unreliable measure of relatedness. The most common hybrid is the mule, a cross between a “jack” (male donkey) and a mare.

A related hybrid, a Ginny, is a cross between a stallion and a jenny (female donkey). Other hybrids include the horse, a cross between a zebra and a horse.

With rare exceptions, most hybrids are sterile and cannot reproduce. Bhimbetka rock painting showing a man riding on a horse, IndiaDomestication of the horse most likely took place in Central Asia prior to 3500 BC.

Two major sources of information are used to determine where and when the horse was first domesticated and how the domesticated horse spread around the world. The first source is based on pathological and archaeological discoveries; the second source is a comparison of DNA obtained from modern horses to that from bones and teeth of ancient horse remains.

The earliest archaeological evidence for the domestication of the horse comes from sites in Ukraine and Kazakhstan, dating to approximately 3500–4000 BC. By 3000 BC, the horse was completely domesticated and by 2000 BC there was a sharp increase in the number of horse bones found in human settlements in northwestern Europe, indicating the spread of domesticated horses throughout the continent.

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The most recent, but most irrefutable evidence of domestication comes from sites where horse remains were interred with chariots in graves of the Sintashta and Petrov cultures c. 2100 BC. Domestication is also studied by using the genetic material of present-day horses and comparing it with the genetic material present in the bones and teeth of horse remains found in archaeological and pathological excavations.

The variation in the genetic material shows that very few wild stallions contributed to the domestic horse, while many mares were part of early domesticated herds. This is reflected in the difference in genetic variation between the DNA that is passed on along the paternal, or sire line (Y-chromosome) versus that passed on along the maternal, or dam line (mitochondrial DNA).

There are very low levels of Y-chromosome variability, but a great deal of genetic variation in mitochondrial DNA. There is also regional variation in mitochondrial DNA due to the inclusion of wild mares in domestic herds.

Another characteristic of domestication is an increase in coat color variation. In horses, this increased dramatically between 5000 and 3000 BC.

Before the availability of DNA techniques to resolve the questions related to the domestication of the horse, various hypotheses were proposed. One classification was based on body types and conformation, suggesting the presence of four basic prototypes that had adapted to their environment prior to domestication.

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Another hypothesis held that the four prototypes originated from a single wild species and that all different body types were entirely a result of selective breeding after domestication. However, the lack of a detectable substructure in the horse has resulted in a rejection of both hypotheses.

Feral horses are born and live in the wild, but are descended from domesticated animals. Many populations of feral horses exist throughout the world.

Studies of feral herds have provided useful insights into the behavior of prehistoric horses, as well as greater understanding of the instincts and behaviors that drive horses that live in domesticated conditions. There are also semi-feral horses in many parts of the world, such as Dartmoor and the New Forest in the UK, where the animals are all privately owned but live for significant amounts of time in “wild” conditions on undeveloped, often public, lands.

Owners of such animals often pay a fee for grazing rights. The concept of purebred bloodstock and a controlled, written breed registry has come to be particularly significant and important in modern times.

Sometimes purebred horses are incorrectly or inaccurately called “thoroughbreds”. Thoroughbred is a specific breed of horse, while a “purebred” is a horse (or any other animal) with a defined pedigree recognized by a breed registry.

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Horse breeds are groups of horses with distinctive characteristics that are transmitted consistently to their offspring, such as conformation, color, performance ability, or disposition. These inherited traits result from a combination of natural crosses and artificial selection methods.

An early example of people who practiced selective horse breeding were the Bedouin, who had a reputation for careful practices, keeping extensive pedigrees of their Arabian horses and placing great value upon pure bloodlines. These pedigrees were originally transmitted via an oral tradition.

In the 14th century, Cartesian monks of southern Spain kept meticulous pedigrees of bloodstock lineages still found today in the Andalusian horse. Breeds developed due to a need for “form to function”, the necessity to develop certain characteristics in order to perform a particular type of work.

Thus, a powerful but refined breed such as the Andalusian developed as riding horses with an aptitude for dressage. Heavy draft horses were developed out of a need to perform demanding farm work and pull heavy wagons.

Other horse breeds had been developed specifically for light agricultural work, carriage and road work, various sport disciplines, or simply as pets. Some breeds developed through centuries of crossing other breeds, while others descended from a single foundation sire, or other limited or restricted foundation bloodstock.

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(Source: www.petguide.com)

One of the earliest formal registries was General Stud Book for Thoroughbreds, which began in 1791 and traced back to the foundation bloodstock for the breed. Worldwide, horses play a role within human cultures and have done so for millennia.

Horses are used for leisure activities, sports, and working purposes. The Food and Agriculture Organization (FAO) estimates that in 2008, there were almost 59,000,000 horses in the world, with around 33,500,000 in the Americas, 13,800,000 in Asia and 6,300,000 in Europe and smaller portions in Africa and Oceania.

The American Horse Council estimates that horse-related activities have a direct impact on the economy of the United States of over $39 billion, and when indirect spending is considered, the impact is over $102 billion. In a 2004 “poll” conducted by Animal Planet, more than 50,000 viewers from 73 countries voted for the horse as the world's 4th favorite animal.

Communication between human and horse is paramount in any equestrian activity; to aid this process horses are usually ridden with a saddle on their backs to assist the rider with balance and positioning, and a bridle or related headgear to assist the rider in maintaining control. Many horses are also driven, which requires a harness, bridle, and some type of vehicle.

Historically, equestrians honed their skills through games and races. Equestrian sports provided entertainment for crowds and honed the excellent horsemanship that was needed in battle.

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Many sports, such as dressage, evening and show jumping, have origins in military training, which were focused on control and balance of both horse and rider. Other sports, such as rodeo, developed from practical skills such as those needed on working ranches and stations.

Horse racing of all types evolved from impromptu competitions between riders or drivers. All forms of competition, requiring demanding and specialized skills from both horse and rider, resulted in the systematic development of specialized breeds and equipment for each sport.

The popularity of equestrian sports through the centuries has resulted in the preservation of skills that would otherwise have disappeared after horses stopped being used in combat. Horses are trained to be ridden or driven in a variety of sporting competitions.

Examples include show jumping, dressage, three-day evening, competitive driving, endurance riding, gymkhana, rodeos, and fox hunting. Horse shows, which have their origins in medieval European fairs, are held around the world.

They host a huge range of classes, covering all the mounted and harness disciplines, as well as “In-hand” classes where the horses are led, rather than ridden, to be evaluated on their conformation. The method of judging varies with the discipline, but winning usually depends on style and ability of both horse and rider.

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Examples of these sports of partnership between human and horse include jousting, in which the main goal is for one rider to unseat the other, and burkas, a team game played throughout Central Asia, the aim being to capture a goat carcass while on horseback. Horse racing is an equestrian sport and major international industry, watched in almost every nation of the world.

There are three types: “flat” racing; steeple chasing, i.e. racing over jumps; and harness racing, where horses trot or pace while pulling a driver in a small, light cart known as a sulky. A major part of horse racing's economic importance lies in the gambling associated with it.

There are certain jobs that horses do very well, and no technology has yet developed to fully replace them. For example, mounted police horses are still effective for certain types of patrol duties and crowd control.

Cattle ranches still require riders on horseback to round up cattle that are scattered across remote, rugged terrain. Search and rescue organizations in some countries depend upon mounted teams to locate people, particularly hikers and children, and to provide disaster relief assistance.

Horses can also be used in areas where it is necessary to avoid vehicular disruption to delicate soil, such as nature reserves. They may also be the only form of transport allowed in wilderness areas.

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Law enforcement officers such as park rangers or game wardens may use horses for patrols, and horses or mules may also be used for clearing trails or other work in areas of rough terrain where vehicles are less effective. Although machinery has replaced horses in many parts of the world, an estimated 100 million horses, donkeys and mules are still used for agriculture and transportation in less developed areas.

This number includes around 27 million working animals in Africa alone. Some land management practices such as cultivating and logging can be efficiently performed with horses.

In agriculture, less fossil fuel is used and increased environmental conservation occurs over time with the use of draft animals such as horses. Logging with horses can result in reduced damage to soil structure and less damage to trees due to more selective logging.

The first archaeological evidence of horses used in warfare dates to between 4000 and 3000 BC, and the use of horses in warfare was widespread by the end of the Bronze Age. Although mechanization has largely replaced the horse as a weapon of war, horses are still seen today in limited military uses, mostly for ceremonial purposes, or for reconnaissance and transport activities in areas of rough terrain where motorized vehicles are ineffective.

Horses have been used in the 21st century by the Janjaweed militias in the War in Darfur. The horse-headed deity in Hinduism, Hayagriva Modern horses are often used to reenact many of their historical work purposes.

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Horses are used, complete with equipment that is authentic or a meticulously recreated replica, in various live action historical reenactments of specific periods of history, especially recreations of famous battles. Horses are also used to preserve cultural traditions and for ceremonial purposes.

Countries such as the United Kingdom still use horse-drawn carriages to convey royalty and other VIPs to and from certain culturally significant events. Public exhibitions are another example, such as the Budweiser Clydesdale's, seen in parades and other public settings, a team of draft horses that pull a beer wagon similar to that used before the invention of the modern motorized truck.

Horses are frequently used in television, films and literature. They are sometimes featured as a major character in films about particular animals, but also used as visual elements that assure the accuracy of historical stories.

The horse frequently appears in coats of arms in heraldry, in a variety of poses and equipment. The mythologies of many cultures, including Greco-Roman, Hindu, Islamic, and Norse, include references to both normal horses and those with wings or additional limbs, and multiple myths also call upon the horse to draw the chariots of the Moon and Sun.

People of all ages with physical and mental disabilities obtain beneficial results from an association with horses. Therapeutic riding is used to mentally and physically stimulate disabled persons and help them improve their lives through improved balance and coordination, increased self-confidence, and a greater feeling of freedom and independence.

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The benefits of equestrian activity for people with disabilities has also been recognized with the addition of equestrian events to the Paralympic Games and recognition of para-equestrian events by the International Federation for Equestrian Sports (FEI). Hippo therapy and therapeutic horseback riding are names for different physical, occupational, and speech therapy treatment strategies that utilize equine movement.

In hippo therapy, a therapist uses the horse's movement to improve their patient's cognitive, coordination, balance, and fine motor skills, whereas therapeutic horseback riding uses specific riding skills. Horses also provide psychological benefits to people whether they actually ride or not.

“Equine-assisted” or “equine-facilitated” therapy is a form of experiential psychotherapy that uses horses as companion animals to assist people with mental illness, including anxiety disorders, psychotic disorders, mood disorders, behavioral difficulties, and those who are going through major life changes. There are also experimental programs using horses in prison settings.

Exposure to horses appears to improve the behavior of inmates and help reduce recidivism when they leave. Products collected from living horses include mare's milk, used by people with large horse herds, such as the Mongols, who let it ferment to produce Luis.

Horse blood was once used as food by the Mongols and other nomadic tribes, who found it a convenient source of nutrition when traveling. Drinking their own horses blood allowed the Mongols to ride for extended periods of time without stopping to eat.

The drug Remain is a mixture of estrogens extracted from the urine of pregnant mares (pregnant ma res' your in e), and was previously a widely used drug for hormone replacement therapy. The tail hair of horses can be used for making bows for string instruments such as the violin, viola, cello, and double bass.

Horse meat has been used as food for humans and carnivorous animals throughout the ages. Approximately 5 million horses are slaughtered each year for meat worldwide.

It is eaten in many parts of the world, though consumption is taboo in some cultures, and a subject of political controversy in others. Horse hooves can also be used to produce animal glue.

Specifically, in Italian cuisine, the horse tibia is sharpened into a probe called a Shinto, which is used to test the readiness of a (pig) ham as it cures. In Asia, the saga is a horsehide vessel used in the production of Luis.

Checking teeth and other physical examinations are an important part of horse care. Horses are grazing animals, and their major source of nutrients is good-quality forage from hay or pasture.

They can consume approximately 2% to 2.5% of their body weight in dry feed each day. Sometimes, concentrated feed such as grain is fed in addition to pasture or hay, especially when the animal is very active.

When grain is fed, equine nutritionists recommend that 50% or more of the animal's diet by weight should still be forage. Horses require a plentiful supply of clean water, a minimum of 10 US gallons (38 L) to 12 US gallons (45 L) per day.

Although horses are adapted to live outside, they require shelter from the wind and precipitation, which can range from a simple shed or shelter to an elaborate stable. Horses require routine hoof care from a farrier, as well as vaccinations to protect against various diseases, and dental examinations from a veterinarian or a specialized equine dentist.

If horses are kept inside in a barn, they require regular daily exercise for their physical health and mental well-being. When turned outside, they require well-maintained, sturdy fences to be safely contained.

Regular grooming is also helpful to help the horse maintain good health of the hair coat and underlying skin. System natural per Regina trial natural :second classes, or dines, genera, species, cum characterizes, differential, synonyms, Louis.

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Conquerors: The Roots of New World Horsemanship (First ed.). 122–123 ^ Examples are the Australian Riding Pony and the Connemara, see Edwards, pp.

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Wiki species has information related to Equus Catullus There are several breeds of horse native to the United States, and many of these majestic beasts can be admired roaming free across the nation's great outdoors.

Microsoft may earn an Affiliate Commission if you purchase something through recommended links in this article Some of the best locations to observe wild horses include Virginia Range, NV.

The vast plains of central Oregon enclose Forest Service land where herds of wild horses can be admired. One of the great spectacles of the American West, a herd of wild horses kicking up dust at full gallop.

Powerful and sturdy, this breed can run a short distance over a straightaway faster than any other horse. Pioneers heading west preferred the breed for its ability to outmaneuver cattle, and it quickly became the cowboy's favorite.

Lively and possessing of an amiable disposition, the horse is a very popular choice for trail riding. Admiring penned herds of untamed horses is a highlight of any ranch or trail riding vacation.

This is the only breed of draft horse developed in the United States that is still in existence today. The horse is a rare breed characterized by its cream coat, pink skin, and amber-colored eyes.

The desert in Utah's range country is another great location to observe these animals in the wild. This horse breed is native to the rolling hills and verdant valleys of eastern Kentucky.

The numbers of wild horses in North Carolina’s Outer Banks have dwindled over the years. The Maryland horses which roam the Assateague Island National Seashore are a huge tourist draw.

Palomino horses have a yellow or gold coat, with a white or light cream mane and tail. In North America, the wild horse is often labeled as a non-native, or even an exotic species, by most federal or state agencies dealing with wildlife management, such as the National Park Service, US Fish and Wildlife Service, and the Bureau of Land Management.

The legal mandate for many of these agencies is to protect native wildlife and prevent non-native species from causing harmful effects on the general ecology of the land. If the idea that wild horses were, indeed, native wildlife, a great many current management approaches might be compromised.

The precise date of origin for the genus Equus is unknown, but evidence documents the dispersal of Equus from North America to Eurasia approximately 2–3 million years ago and a possible origin at about 3.4–3.9 million years ago. Dr. Ross Machete, Curator of Mamma logy at the American Museum of Natural History, and colleagues, have dated the existence of woolly mammoths and horses in North America to as recent as 7,600 years ago.

Had it not been for previous westward migration, over the 2 Bering Land Bridge, into northwestern Russia (Siberia) and Asia, the horse would have faced complete extinction. In 1493, on Columbus’ second voyage to the Americas, Spanish horses, representing E. Catullus, were brought back to North America, first in the Virgin Islands, and, in 1519, they were reintroduced on the continent, in modern-day Mexico, from where they radiated throughout the American Great Plains, after escape from their owners or by pilfering (Fabio 1995).

Equus, a monophyletic taxon, is first represented in the North American fossil record about four million years ago by E. simplifies, and this species is directly ancestral to later Blanca species about three million years ago (Harold and Voorhees 1990). Azzaroli (1992) believed, again on the basis of fossil records, that E. simplifies gave rise to the late Pliocene E. Idahoans, and that species, in turn, gave rise to the first tabloid horses two million years ago in North America.

By ecomorphotype, we refer to differing phenotypic or physical characteristics within the same species, caused by genetic isolation in discrete habitats. In North America, isolated lower molar teeth and a mandible from sites of the Irvington age appear to be E. Catullus, morphologically.

While earlier taxonomists tried to deal with the subjectivity of choosing characters they felt would adequately describe, and thus group, genera and species, these observations were lacking in precision. Nevertheless, the more subjective pale ontological data strongly suggests the origin of E. Catullus somewhere between one and two million years ago.

A series of genetic analyses, carried out at the San Diego Zoo’s Center for Reproduction in Endangered Species, and based on chromosome differences (Benirschke et al. 1965) and mitochondrial genes (George and Ryder 1986) both indicate significant genetic divergence among several forms of wild E. Catullus as early as 200,000–300,000 years ago. 4 The relatively new (30-year-old) field of molecular biology, using mitochondrial-DNA analysis, has recently revealed that the modern or cabal line horse, E. Catullus, is genetically equivalent to E. samba, a horse, according to fossil records, that represented the most recent Equus species in North America prior to extinction.

According to the work of researchers from Appeal University of the Department of Evolutionary Biology (Forster 1992), the date of origin, based on mutation rates for mitochondrial-DNA, for E. Catullus, is set at approximately 1.7 million years ago in North America. Charles Vila, also of the Department of Evolutionary Biology at Appeal University, has corroborated Forster’s work.

Vila et al. (2001) have shown that the origin of domestic horse lineages was extremely widespread, over time and geography, and supports the existence of the tabloid horse in North American before its disappearance, corroborating the work of Benirschke et al. (1965), George and Ryder (1995), and Hubbard (1955). A study conducted at the Ancient Biomolecules Center of Oxford University (Winston et al. 2005) also corroborates the conclusions of Forster (1992).

Despite a great deal of variability in the size of the Pleistocene equips from differing locations (mostly ecomorphotypes), the DNA evidence strongly suggests that all the large and small cabal line samples belonged to the same species. In another study, Kruger et al. (2005), using micro satellite data, confirms the work of Forster (1992) but gives a wider range for the emergence of the tabloid horse, of 0.86 to 2.3 million years ago.

Fast and McCullough (1976) dubbed this “social conservation” in his paper on behavior patterns and communication in the Pryor Mountain wild horses. The non-native, feral, and exotic designations given by agencies are not merely reflections of their failure to understand modern science but also a reflection of their desire to preserve old ways of thinking to keep alive the conflict between a species (wild horses), with no economic value any more (by law), and the economic value of commercial livestock.

Native status for wild horses would place these animals, under law, within a new category for management considerations. As a form of wildlife, embedded with wildness, ancient behavioral patterns, and the morphology and biology of a sensitive prey species, they may finally be released from the “livestock-gone-loose” appellation.

Jay F. Kirkpatrick, Director, The Science and Conservation Center, Zoo Montana, Billings, holds a Ph.D. in reproductive physiology from the College of Veterinary Medicine at Cornell University. Patricia M. Fabio, Research Fellow, The Science and Conservation Center, Zoo Montana, Billings, holds a B.S.

However, this article may be copied and distributed freely in hard copy, electronic, or website form, for educational purposes only. Przewalski's horse had reached the brink of extinction but was reintroduced successfully into the wild.

The Tarzan became extinct in the 19th century, though it is a possible ancestor of the domestic horse; it roamed the steppes of Eurasia at the time of domestication. However, other subspecies of Equus ferns may have existed and could have been the stock from which domesticated horses are descended.

Since the extinction of the Tarzan, attempts to have been made to reconstruct its phenotype, resulting in horse breeds such as the König and Heck horse. However, the genetic makeup and foundation bloodstock of those breeds is substantially derived from domesticated horses, so these breeds possess domesticated traits.

The term “wild horse” is also used colloquially in reference to free-roaming herds of feral horses such as the mustang in the United States, the crumby in Australia, and many others. These feral horses are untamed members of the domestic horse subspecies (Equus ferns Catullus), not to be confused with the truly “wild” horse subspecies extant into modern times.

E. Ferus has had several subspecies, only three of which have survived into modern times: The latter two are the only never-domesticated “wild” groups that survived into historic times.

In the Late Pleistocene epoch, there were several other subspecies of E.ferns which have all since gone extinct. The exact categorization of Equus' remains into species or subspecies is a complex matter and the subject of ongoing work.

Equus ferns fossil from 9100 BC found near Dense, at the Zoological Museum in CopenhagenProbable European wild horse coat colors The horse family Equine and the genus Equus evolved in North America during the Pliocene, before the species migrated across Bering into the Eastern Hemisphere. Studies using ancient DNA, as well as DNA of recent individuals, suggest the presence of two equine species in Late Pleistocene North America, a cabal line species, suggested being nonspecific with the wild horse, and Haringtonhippus Francisco, the “New World stilt-legged horse”; the latter has been taxonomically assigned to various names, and appears to be outside the grouping containing all extant equines.

Currently, three subspecies that lived during recorded human history are recognized. One subspecies is the widespread domestic horse (Equus ferns Catullus), as well as two wild subspecies: the recently extinct Tarzan (E. f. ferns) and the endangered Przewalski's horse (E. f. przewalskii).

Genetically, the pre-domestication horse, E. f. ferns, and the domesticated horse, E. f. Catullus, form a single homogeneous group (clade) and are genetically indistinguishable from each other. The genetic variation within this clade shows only a limited regional variation, with the notable exception of Przewalski's horse.

Besides genetic differences, astrological evidence from across the Eurasian wild horse range, based on cranial and metacarpal differences, indicates the presence of only two subspecies in post glacial times, the Tarzan and Przewalski's horse. At present, the domesticated and wild horses are considered a single species, with the valid scientific name for the horse species being Equus ferns.

The wild Tarzan subspecies is E. f. ferns, Przewalski's horse is E. f. przewalskii, and the domesticated horse is E. f. Catullus. The rules for the scientific naming of animal species are determined in the International Code of Zoological Nomenclature, which stipulates that the oldest available valid scientific name is used to name the species.

Previously, when taxonomists considered domesticated and wild horse two subspecies of the same species, the valid scientific name was Equus Catullus Linnaeus 1758, with the subspecies labeled E. c. Catullus (domesticated horse), E. c. ferns Border, 1785 (Tarzan) and E. c. przewalskii Polio, 1881 (Przewalski's horse). However, in 2003, the International Commission on Zoological Nomenclature decided that the scientific names of the wild species have priority over the scientific names of domesticated species, therefore mandating the use of Equus ferns for the horse, independent of the position of the domesticated horse.

Przewalski's horse occupied the eastern Eurasian Steppes, perhaps from the Urals to Mongolia, although the ancient border between Tarzan and Przewalski's distributions has not been clearly defined. Przewalski's horse was limited to Dzungaria and western Mongolia in the same period, and became extinct in the wild during the 1960s, but was reintroduced in the late 1980s to two preserves in Mongolia.

Although researchers such as Maria Gimbals theorized that the horses of the Paleolithic period were Przewalski's, more recent genetic studies indicate that Przewalski's horse is not an ancestor to modern domesticated horses. However, it was subsequently suggested that Przewalski's horse represent feral descendants of horses belonging to the Bowie culture.

Przewalski's horse is still found today, though it is an endangered species and for a time was considered extinct in the wild. Roughly 2000 Przewalski's horses are in zoos around the world.

A small breeding population has been reintroduced in Mongolia. As of 2005, a cooperative venture between the Zoological Society of London and Mongolian scientists has resulted in a population of 248 animals in the wild.

However, the offspring of Przewalski and domestic horses are fertile, possessing 65 chromosomes. For instance, when the Spanish reintroduced the horse to the Americas, beginning in the late 15th century, some horses escaped, forming feral herds; the best-known being the mustang.

Similarly, the crumby descended from horses strayed or let loose in Australia by English settlers. Isolated populations of feral horses occur in a number of places, including Bosnia, Croatia, New Zealand, Portugal, Scotland and a number of barrier islands along the Atlantic coast of North America from Sable Island off Nova Scotia, to Cumberland Island, off the coast of Georgia.

In 1995, British and French explorers discovered a new population of horses in the Roche Valley of Tibet, unknown to the rest of the world, but apparently used by the local Samba people. It was speculated that the Roche horse might be a relict population of wild horses, but testing did not reveal genetic differences with domesticated horses, which is in line with news reports indicating that they are used as pack and riding animals by the local villagers.

These horses only stand 12 hands (48 inches, 122 cm) tall and are said to resemble the images known as “horse no 2” depicted in cave paintings alongside images of Przewalski's horse. IUCN Red List of Threatened Species.

Przewalski's Horse: The History and Biology of an Endangered Species. Albany, New York Colin P. Groves: State University of New York Press.

^ a b Laundry, Penile Johansen; Evening, Jens-Christian (2015-07-15). “A Geographic Assessment of the Global Scope for Rewinding with Wild-Living Horses (Equus ferns)”.

^ Villavicencio, Natalia A.; Corcoran, Derek; Marque, Pablo A. “Assessing the Causes Behind the Late Quaternary Extinction of Horses in South America Using Species Distribution Models”.

^ Orlando, Ludovic; Male, Dean; Albert, Maria Teresa; Prado, Jose Luis; Print, Alfredo; Cooper, Alan; Hanna, Catherine (2008-05-01). “Ancient DNA Clarifies the Evolutionary History of American Late Pleistocene Equips”.

^ Usukhjargal, Dorm; Hen kens, Renew H. G.; Boer, Willem F. DE; Los, Angeles E. W. DE; Ra's, Erica; Dune, Caroline van (August 28, 2009). “Wolf Predation Among Reintroduced Przewalski Horses in Hastie National Park, Mongolia”.

^ Provost, Melanie; Bell one, Rebecca; Bedecked, Norbert; Sandoval-Castellanos, Edson; Paisley, Michael; Kuznets ova, Tatyana; Morales-Muñiz, Arturo; O'Connor, Terry; Weissmann, Monika; Forfeited, Michael; Ludwig, Are (15 November 2011). “Genotypes of domestic horses match phenotypes painted in Paleolithic works of cave art”.

^ “Equus Catullus (horse)”. “Evolution, systematic, and paleogeography of Pleistocene horses in the New World: a molecular perspective”.

^ Barrón-Ortiz, Christina I.; Rodrigues, Antonia T.; Theodor, Jessica M.; Goodman, Brian P.; Yang, Dong ya Y.; Speller, Camilla F.; Orlando, Ludovic (17 August 2017). “Cheek tooth morphology and ancient mitochondrial DNA of late Pleistocene horses from the western interior of North America: Implications for the taxonomy of North American Late Pleistocene Equus”.

Paula, G.D.; Machete, R.D.E; Scott, E.; Cahill, J.A. Stiller, M.; Woollier, M.J.; Orlando, L.; South on, J.; Free, D.G.

“The Diversity of South American Equus: Did Size Really Matter?” ^ Her Parisian, Clio; Airstrip, Julia T.; Schubert, Mikkel; Seguin-Orlando, Ancient; EME, David; Winston, Jacob; Albert, Maria Teresa; Martin, Fabian; Lopez, Patricio M.; Prado, Jose L.; Print, Alfredo; Douay, Christophe J.; Stafford, Tom W.; Wellesley, ESE; Orlando, Ludovic (March 2015).

“Mitochondrial genomes reveal the extinct as an out group to all living equips”. ^ a b c Orlando, Ludovic; Male, Dean; Albert, Maria Teresa; Prado, Jose Luis; Print, Alfredo; Cooper, Alan; Hanna, Catherine (9 April 2008).

“Ancient DNA Clarifies the Evolutionary History of American Late Pleistocene Equips”. ^ CAI, Data; Huawei Tang; Lu Han; Camilla F. Speller; Dong ya Y. Yang; Violin Ma; Jean'en Can; Hong AHU; Hui Zhou (2009).

“Ancient DNA provides new insights into the origin of the Chinese domestic horse”. ^ a b Vila, Charles; Jennifer A. Leonard; Andes Götherström; Stefan Maryland; Key Sandberg; Keratin Laden; Robert K. Wayne; Hans Allergen (2001).

“Widespread Origins of Domestic Horse Lineages” (PDF). ^ LAU, Allison; Lei Peng; Pirogi Got; Leona Chem nick; Oliver A. Ryder; Kateryna D. Dakota (2009).

“Horse Domestication and Conservation Genetics of Przewalski's Horse Inferred from Sex Chromosomal and Autosomal Sequences”. ^ Jansen, Thomas; Forster, Peter; Levine, Marsha A.; Else, Hardy; Hurdles, Matthew; Renfrew, Colin; Weber, Jürgen; Ole, Klaus (6 August 2002).

“Quaternary Horses : possible candidates to domestication”. The Horse: its domestication, diffusion and role in past communities.

Proceedings of the XIII International Congress of Prehistoric and Protohistoric Sciences, For, Italy, 8–14 September 1996. ^ Mills, Daniel S.; Bankers, Kathryn J.

Equine Behavior: Principles and Practice. “Usage of 17 specific names based on wild species which are predated by or contemporary with those based on domestic animals (Lepidoptera, Osteichthyes, Mammalian): conserved.

System natural per Regina trial natural :second classes, or dines, genera, species, cum characterizes, differential, synonyms, Louis. “Ecological substitutes for Wild horse and Aurochs” (PDF).

^ “The naming of wild animal species and their domestic derivatives (PDF Download Available)”. ^ Bunker, Emma C.; Watt, James C. Y.; Sun, Chitin; N.Y.), Metropolitan Museum of Art (New York (2002).

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On some cowboy shows on TV, I've heard the word “cow horse” also used. It's a huge variety. When the cattle industry first started in the US, all horses were smaller.

Not as rough as most old shows would have you think, but not given as much time as young horses today get. Now, I see quarter horses, the purebreds are more common in the southern states.

I also see thoroughbreds, with good bone, Tennessee Walkers, Morgans, various paints. In the northern states, it's not unusual to see horses 16 hands high and weighing 1150 to 1300#.

It's a huge variety. When the cattle industry first started in the US, all horses were smaller. Not as rough as most old shows would have you think, but not given as much time as young horses today get.

Now, I see quarter horses, the purebreds are more common in the southern states. I also see thoroughbreds, with good bone, Tennessee Walkers, Morgans, various paints.

In the Western states you see that wide variety. Down south, you see more purebred/registered quarter horses. Now among ranchers there is discussion about going back to cattle with a smaller frame.

And you “can' handle large cattle with a small horse but it takes more finesse. If you're talking about the 19th century, breeds as we know them today didn't exist in the American west for the most part.

Ranchers who had a horse that was “copy” would breed them and improve their stock, but most horses used in ranch work were caught from the feral herds or otherwise of uncertain parentage. The Army breeding programs in the late 19th and early 20th centuries contributed some good blood with TB, Arabian, and Morgan genes to what would eventually become the Quarter Horse, but the greatest contributions were from feral horses and sprinting Thoroughbreds carefully selected and bred for quickness, agility, and a good head for cow work.

I think QHs are probably one of the easiest breeds to get, as well as that they typically have a good disposition for working cattle, so that's why they're pretty popular among cowboys. Big horses are more useful for roping and working cows, but I've seen that a lot of riders tend to prefer the “smoothest and surest” horse when it comes to range riding.

Trail riding it is a mix but for actual ranch work, hands down most are quarter horses here. Where you start to see more diversity here is in other disciplines and pleasure riding then you get more different breeds here.

Horse lovers have long believed that their trusty steeds are the smartest animals in the world, but skeptics would be doubtful. While we most often compare them to dogs when asking ‘are horses intelligent?’ This is, in fact, not a fair comparison.

So those stories of horses being over cuddly when their owners are upset or refusing to come over to you when you’re grumpy aren’t just coincidence, after all. All of these show that horses learn via conditioning, and that through trial and error they can figure out the correct response to a question or situation.

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