Are Horses Grazers

David Lawrence
• Friday, 02 October, 2020
• 38 min read

Horses are selective grazers, or they prefer young, immature plants and will graze some areas down to the bare ground. By utilizing management techniques, the quality of the pasture the horse consumes can be enhanced.

grazing horses pastures horse health remember grow farm
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Continuous grazing is the most common form of grazing (figure 1), which consists of a group of animals having continual access to an area of land over a set period. If the area is small, limit grazing can be used to decrease the amount of time a horse has to eat.

The rest allows pasture plants to benefit with more growth and vigor, and the forage supply tends to be more nutritious. Even small parcels of land can be divided into two or more regions to maximize plant growth.

If the pasture can't be eaten to the recommended height, it can be mowed or made into hay. Following the 7-14 days grazing period, the field should have about a month's rest for forage growth before horses are rotated back.

While the area is empty, break up manure piles by dragging a chain link or spike tooth harrow over the pasture. Design the space to contain a sacrifice paddock, which is an area where horses can be placed in periods of excessive rainfall, extended drought, or other times during which the horse presence on the regular paddocks could cause plant or soil damage.

Electric fences are commonly used to set up a rotational grazing system. Paddock = Sacrifice area, S = Shelter, W = Water Install a surge protector Use adequate ground rods (three feet per one joule of output).

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It worked for our horses wild ancestors, but is it wise to co-graze equines and livestock today? Horses belonging to farmers may be turned out with the cattle or sheep, but, on the whole, equines are managed separately.

Think of the plains of Africa where antelopes, zebras, elephants, giraffes, rhinos and others all graze and browse. Because cattle don’t support the same nematode worms as horses but will ingest their eggs as they graze, worm burdens in horses grazed with cattle are lower and the requirement for workers is reduced.

Diets of feral horses in Australia have been reported to include a substantial portion of shrubs and tree foliage. Little attention has been directed at systematically listing the number and types of foliage eaten by horses in a natural setting.

In a presentation at the Australian Equine Science Symposium, researchers from New South Wales, Australia, described a study that will look at the time spent by horses in browsing behavior as well as the nutritional profiles and palatability of various types of tree and shrub foliage. September 19, 2014January 1, 2018By Kentucky Equine Research Staff article in Journal equine Veterinary Science presented information on production and environmental impacts of grazing that might be of interest to horse owners and property managers.

Given a choice, horses prefer not to graze in areas that are close to piles of manure. Equines that have had their grazing time restricted tend to eat with great intensity when they have access to pasture, and can ingest a quantity of grass far above what the average horse eats in a comparable amount of time.

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Horses belonging to farmers may be turned out with the cattle or sheep, but, on the whole, equines are managed separately. Think of the plains of Africa where antelopes, zebras, elephants, giraffes, rhinos and others all graze and browse.

Because cattle don’t support the same nematode worms as horses but will ingest their eggs as they graze, worm burdens in horses grazed with cattle are lower and the requirement for workers is reduced. But it was not until perhaps ten thousand years ago that human societies began the dance of domestication with the horse.

Horses provided these early horse folk with much of the essentials they needed for group survival. To understand the domestication process is to enhance our appreciation of equine behavior.

Horses apparently became domesticated because they found a niche with people long ago on the steppes of Kazakhstan. Both trained and wild horses existed in this realm south of Russia and west of China.

By the early 20th century the closest living relative to Equus Catullus, the Tarzan, had gone extinct. It appears to have taken tens of thousands of years to fully domesticate the horse, and to eventually attain control of breeding.

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Breeding initially consisted primarily of selection for docility and amenability to captivity, and later milking, riding, driving, and stabling. In addition to genetics, this presentation will focus on the socialization aspect of raising horses, and portray the importance of nurture on the eventual behavioral and physical health of the adult athlete.

This new role of the horse requires renewed studies and considerations of equine behavior. As well, appropriate breeding, socialization, and training of horses helps minimize behavioral wastage.

Evolution and domestication provide a basis for the understanding of equine behavior. To become a partner with the flighty, powerful (but trainable and tamable) grazer of the plains remains the horse folk goal.

This learning behavior is a result of evolutionary development of a complex social lifestyle. In the latest revolution of horsemanship, the area of appropriate socialization and stabling has not received the attention it deserves.

They prefer calm, and learn most efficiently in tranquil, familiar settings. To succeed in our endeavors with horses (whatever the equine goals or pursuits), our horses are best served to receive what they preferentially need and require behaviorally, nutritionally, socially, physically, environmentally, visually, and metabolically.

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Horses raised out of the herd context are vulnerable to behavioral insecurities later in life. In this article, I attempt to clarify humankind's social and communicative similarities to horses.

Horse has been brought into the circle of humanity, along with a dozen or so other domesticates that share an adequate socialite with mankind to be allowed to develop a mutually beneficial relationship. In natural settings, horses move about grazing, playing, trekking, and variety of other movements as much a two-thirds of the time.

Plentiful loco motor activity facilitates behavioral expression and maintains physiologic health. Despite domestication and selective breeding for docility and captivity, horse health remains dependent on locomotion.

Horses deprived of locomotion and constant forage ingestion develop strategies to maintain the motion and oral security they feel they need to survive. When horses are deprived of adequate and abundant locomotion, they develop strategies to keep themselves and their jaws moving, as is their essential and inherent nature.

Horses deprived of friends, forage, and locomotion are at risk to develop stereotypes to provide themselves with the movement they need to survive. Horses that are not afforded the opportunity to graze and walk much of the time take up with behaviors to replicate essential locomotion.

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Horses require friends, forage, and locomotion to stay healthy and productive. Additionally, horses need clean air and abundant space for optimum health.

Open grasslands and steppes are the geography and environs from where the most recent predecessors of Equus Catullus evolved. The further we remove horses from their social grazer of the plains preferences, the more health issues develop that require treatment and management by veterinarians and horse folk.

Stabling, stalling, hospitalization and transport all deprive horses of their preferences for friends, forage, and locomotion. Stabling creates bad air, and allows pathogens and parasites to travel easily between horses.

Once our horses behavioral needs are understood, appreciated, and fulfilled, the learning and training can begin. Those strategies that best replicate the grazer of the plains' scenario promote the best health, learning, and performance from horses.

Metabolic, digestive, circulatory, hoof health, musculoskeletal, and nervous, systems, as well as the all other systems and functions of the horse, are dependent upon adequate and appropriate locomotion for normal functioning and/or healing. For horses that are hospitalized, paddocked, stabled, and corralled; active implementation and re-creation of the social pasture setting is required to optimize and maintain health and promote healing.

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Medical conditions are apt to deteriorate in the face of the deprivations of forage, friends, and locomotion created by stabling and hospitalization. Re-creation of a natural setting in the stall is the biggest challenge veterinarians face in maintaining the health of stabled horses.

In addition to appropriate medical treatment, veterinarians and stable managers must creatively provide horses with abundant socialization, forage, and locomotion to maintain health and facilitate healing within the parameters of acceptable medical and surgical treatment. Restriction of locomotion to facilitate healing necessitates the implementation of enrichment strategies to simulate locomotion, including massage, passive flexion, and a wide variety of physical therapies.

Horses are of increasing relevance in agriculturally managed grasslands across Europe. There is concern to what extent grazing with horses is a sustainable grassland management practice.

Our study analyses the relative importance of grazing system (grazer species and regime) and grassland management for vegetation characteristics in grasslands as indicator for sustainable management. We monitored grassland vegetation in western central Germany and compared paddocks grazed by horses under two different regimes, continuous (HC) vs. rotational (HR), to paddocks grazed by cattle (C) under similar trophic site conditions.

We observed more plant species and more High Nature Value indicator species on HC compared to C. The vegetation of C was more grazing tolerant and had higher forage value than HC. Regardless of the grazing regime, the competitive component was lower, the stress-tolerant component higher and the logistic contrast between patch-types stronger on HC and HR paddocks compared to C. Species richness was strongly influenced by the extent of the logistic contrast.

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Our results emphasize the potential of horse grazing for biodiversity in agriculturally managed grasslands. Grazing livestock is seen as a promising option for maintaining and promoting grassland biodiversity .

Due to the preferences of grazing animals in forage selection, their disturbance of the sward and patchy nutrient return , they increase and maintain the spatial heterogeneity of the sward structure and vegetation composition . This heterogeneity means that plants of different strategy types and demands can coexist in proximity, increasing plant species turnover within the paddock, i.e., diversity .

Differences in grazing regimes and thus vegetation between paddocks can also contribute to the landscape-scale biodiversity . Gautier et al. recently emphasized the importance of diverse grasslands with both species-rich local communities (diversity) and large compositional differences between sites (diversity) for the multi functionality of ecosystems on a global scale.

Different grazer species lead to different effects on grassland vegetation due to their specific nutritional demands, jaw anatomy and grazing behavior . In Europe, cattle are the most common grazing animals in agriculturally managed grasslands.

Several studies have analyzed their grazing effects and management strategies for biodiversity benefits . Horse keeping and grazing is widespread nowadays and has a considerable effect on the shape of agricultural landscapes , particularly in peri-urban regions .

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Horse keepers often rely on grassland that had been released from intensive dairy production . Compared to grasslands managed with cattle or sheep, those grazed with horses have received little scientific attention in Europe with regard to a targeted grassland utilization.

Several characteristics make horse husbandry suitable for the management of extensive grasslands. There is concern to what extent grazing with horses is a sustainable grassland management practice.

Their two pairs of incisors enable them to graze more selectively and closer to the ground . As selective grass feeders horses increase the proportion of forms in the swards .

Since horses actively avoid grazing where they defecate, they create distinct ungraded tall grass latrine areas where excreta and nutrients accumulate. Repeatedly grazed short patches, on the other hand, experience nutrient export, which result in a nutrient transfer and a corresponding vegetation shift between patch types .

Therefore, the patch grazing effect of horses is expected to be stronger than that of cattle . Running and trampling lead to areas with bare and compressed soil .

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Under continuous grazing, grazers have unrestricted access to a paddock during prolonged periods of the grazing season, which promotes the development of distinct short and tall grass patches . Generally, grazing effects on the vegetation increase with stocking density.

While cattle tend to defoliate the grass sward more evenly with increasing stocking density, thereby creating a homogenous sward of grazing tolerant plants , horses continue to graze heterogeneously, avoid foraging on latrine areas and defoliate strongly in other areas . Only few studies have been carried out in the last century that looked more closely at the grazing preferences of horses .

More recently, research has focused on free-ranging horses grazing in nature reserves to study the effects of horse grazing on grassland vegetation and sward structure , some demonstrating benefits for nature conservation . However, these results are not directly transferable to agricultural grassland with domesticated horses.

Thus, there is currently a considerable lack of scientific knowledge on the effects of grazing by domesticated horses on vegetation in a normal agricultural context. This has consequences for the practice of horse grazing, which is often inappropriate and causes land use conflicts in peri-urban and rural landscapes .

Given this background, our study aimed to investigate the effect of horse compared to cattle grazing on vegetation characteristics in agricultural grassland. Target variables were the vascular plant species richness, the High-Nature-Value (HPV) plant indicator species richness, the proportion of Grime’s C-S-R-strategy types , the grassland utilization indicator values and the diversity between patch types.

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The methodology of the observational study has become well established in recent years to assess the medium to long-term effects of different agricultural management methods. At the same time, the identification of interactions with the site conditions would require complex, multi-site field experiments.

Beyond grazing system, grassland management (stocking density and fertilization) affects species richness. The study region has a naturally low agricultural production potential.

A humid climate and shallow, loamy, acidic camisole led to grasslands being the predominant land-use system (65% to 90% of the utilized agricultural area) after forests . Grasslands in the study region are mainly used for dairy production, but horses play a considerable role too.

According to the local livestock numbers (Animal Health Fund, oral communication), at least 10% of grasslands in the study region are managed with horses. The paddocks were arranged in 26 triplets that covered a gradient of different site conditions and land-use intensities ().

The study design did not distinguish the grazing regime in cattle paddocks, which included rotational and continuous stocking. The paddocks within a triplet were located at a linear distance of no more than 2 km and were selected as having similar site factors (i.e., soil type, slope, altitude).

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On each paddock, three circular subplots of 12.6 m² (radius of 2 m) were established for the assessment of vascular plant species richness, composition and soil properties (c). For this, we measured the compressed sward height within each paddock using a rising plate meter (30 cm diameter, 200 g ) at 50 randomly chosen points.

Short patches were defined as heavily grazed areas with a mean sward height below the paddock’s average. Subplots for the vegetation analysis were established at the end of the grazing season of the preceding year when the heterogeneity of the sward height was most pronounced.

Soil was sampled on each subplot in autumn at the end of the grazing season in order to determine the pH and the extractable soil nutrients (available plant nutrients P 2 O 5, K 2 O in mg per 100 g dry matter (DM), calcium-acetate-lactate analysis). In the statistical analysis we used the average soil nutrient concentration of three subplots ().

For the present analysis, management data that covered a period of the preceding five years were collected. Live weights were converted to standard livestock units (500 kg live weight) per hectare and year to calculate stocking rate (ha 1 year 1).

Some paddocks were not only grazed but also mown for hay or haulage (C: n = 16; HC: n = 12, HR: n = 7). The amount and type of fertilizer that was applied on the grasslands was recorded for mineral N, farmyard manure and slurry separately.

horse grazing horses centauress deviantart colics should pasture freebigpictures groups doctorramey
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The total amount of nitrogen supply (N kg ha 1 year 1) was deduced from this information (see). Species Data Vegetation surveys were carried out in 2013 and 2014 with 13 triplets per year.

In both surveys, the total number of vascular plant species in the three subplots per paddock were identified to species level and their individual share of biomass was visually estimated. In addition to plant species richness, we assessed the number of High-Nature-Value (HPV) plant indicator species according to the German Federal Agency for Nature Conservation .

We applied the regional list of HPV indicator species for the mid-west/north-west of Germany . The number of single HPV indicator species per paddock (Invest) was used as a proxy for the nature conservation value of the respective grassland.

Based on the estimated proportion of biomass per species, we calculated the C-S-R signature for each of the three subplots per paddock. In a first step, mixed effects models with a Gaussian distribution were set up for each species response variable.

Vegetation variables, i.e., SR, Invest, Grime’s strategy types, utilization indicator values and Sorenson index were modelled as a function of grazing system, stocking rate, nitrogen fertilization, mowing, trophic site conditions and soil-chemical variables. All global models were checked for multicollinearity between explanatory variables (fixed effects) using variance inflation factors (If).

grazing horse paard
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All global models were checked visually for normal distribution and homoscedasticity of residuals. In case of heterogeneity of variance, weights structures were applied following the protocol of Four et al. .

All explanatory variables were centralized to zero means and scaled to 0.5 standard deviations before analysis, which allows a direct comparison of effects of all fixed factors. For each global model, second-order Alike information criterion ICC was calculated on every possible combination of variables.

Relative importance was estimated as the sum of Alike weights over all models including the explanatory variable in the 95% confidence set. Based on the model averaging, a minimum adequate model (Mam) was identified and the variable grazing system was tested for differences among the grazing systems via post how pairwise Turkey test.

In a second step, further linear mixed effects models were set up to analyze the relationship between vegetation characteristics (promotion of Grime’s strategy types, utilization indicator values and logistic contrast) and SR. For this, SR was modelled as a function of grazing system and each vegetation variable, as well as their interaction. In a third step, linear mixed effects models were set up to analyze effects of grazing system and the interaction with grazing intensity as well as Fertilization on SR and Invest.

In all models, triplet was included as random term, to account for the nesting structure of the study design, which generates a more powerful analysis by ensuring that variance due to block is taken into account and not just included in the error term. The average species number (SR) per paddock (referring to the sampled area of 138 m², each) was 57 (min 24, max 129).

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Of these, 55% of HC and 26% of C were assigned as HNWI grasslands of exceptionally high-nature-value with more than eight HPV indicator species. Effect of Grazing System on Species Richness and Vegetation Characteristics (H) According to the model averaging results, a high relative importance of the variable grazing system was obtained for the majority of the target variables.

These effects were significant in the full models for SR, Invest, forage indicator value and the logistic contrast between patch types (). Postdoc testing of the minimum adequate models (Mam) confirmed significant differences among grazing systems for each vegetation variable, except for the component of federal strategy type, and in tendency to trampling tolerance ().

A higher proportion of the competitive component was associated with an overall decrease in SR (p < 0.001, LME) and similar, but less pronounced, a higher proportion of the federal component was linked with a decreasing SR (p = 0.02, LME). In contrast, species richness increased (p < 0.001, LME) with the proportion of the stress-tolerant component ().

SR was negatively correlated with all utilization indicator values (p < 0.001 in all cases, LME), with slightly lower values for continuously grazed horse paddocks. Both HC and HR showed a stronger logistic contrast between short and tall patches than C (,).

The logistic contrast significantly affected SR as well as Invest on paddock scale. Effect of Grassland Management on Species Richness (H) Both within the model averaging approach and in the Mams, neither stocking rate nor N fertilization was a significant predictor of SR or Invest when applied equally weighted to the same model as the variable grazing system and site conditions ().

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However, the Mam showed a trend of decreasing SR with additional mowing for forage conservation (). Stocking rate affected strategy types as well as utilization indicator values.

As indicated by model averaging, the effect of grazing system remained significant. However, no significant relationship of the grazing system with stocking rate or N fertilization was found.

To our knowledge, this is the first study systematically examining the vegetation characteristics of horse-grazed paddocks in managed temperate grasslands. Compared to experimental studies, observational studies are more challenging in data analysis as effects of land use (e.g., type of livestock, grazing regime, grazing intensity and fertilization) are confounded with those of the site conditions .

In this study we confirmed that the site conditions have an effect on the vegetation and that they interact with land use variables . In order to cope with this situation, we employed a rigid study design with a rather large number of replications and applied a statistical approach of multi-model-inference.

At similar site conditions we directly compared their vegetation characteristics to those of paddocks grazed by horses. We found grazing system to be of a high relative importance for almost every measured vegetation variable when applied to the same model as variables of site conditions and grassland management.

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Using the regional classification key , we identified 55% of HC compared to 26% of C as high-nature-value grassland with more than eight HPV indicator species per paddock. Even considering that our monitoring transects (2 m × 50 m) are longer than those used for regular HNV-monitoring (2 m × 30 m), this is an important finding, since less than 14% of grasslands in Germany have recently been evaluated as being of high-nature-value .

While horses select for grasses, cattle prefer forms (dicotyledonous species), which is assumed to be due to their different digestive systems . The proportion of the federal strategy component was high (>40%) in all treatments, but it was neither related to SR, nor were there differences between horse- and cattle-grazed paddocks.

They benefit from nitrogen fertilization and are related to reduced species richness . Differences in utilization values between grazing regimes in horse-grazed paddocks were not significant.

Nevertheless, a tendency for higher forage quality in HR compared to HC indicates that the grazing regime might have an effect on the astronomical value of such grasslands as has also been shown in experimental approaches . Further research is needed in the future where herbage is sampled and analyzed for its nutritive value under different grazing regimes in the farming practice.

This finding confirms the presumed clear diversification effect of the sward in horse grazing. In a study on wetlands managed for nature conservation, variation in the vegetation composition between patch types was found .

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This variation depended on the grazer species, with horses creating a larger heterogeneity than cattle. A greater sward heterogeneity means that there is a greater variety of varying environmental conditions (niches) at a small spatial scale which allows a higher plant species richness on the paddock scale .

This phenomenon is generally known and has been suggested as a key driver for biodiversity in grasslands at the local and the landscape scale . It is noteworthy that the horse paddocks showed a larger sward heterogeneity than the cattle pastures irrespective of the grazing regime (HC or HR).

Usually, farmers prefer rotational over continuous grazing because rotational grazing ensures a more uniform herbage utilization, reduces the formation of patches of different sward height, prevents overgrazing and provide herbage of a higher quality . Our results on logistic contrasts, however, indicate that this approach may be less effective than assumed under horse grazing.

Nevertheless, horse keepers often do not aim at maximizing grassland yields and are thus able to tolerate a heterogeneous sward structure to some extent. Effects of Grassland Management on Species Richness Beyond the effects of the grazing system, it was assumed that the intensity of grassland management (stocking density and fertilization) influences SR (H).

With an average nitrogen fertilization of about 40 kg ha 1 year 1 and an average stocking rate of 1.5 ha 1 year 1 the grasslands in the present study were managed quite extensively. However, when included in the same global model as grazing system and other variables on management and site condition, fertilization was of low relative importance for most vegetation characteristics.

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Paddocks with additional mowing for forage conservation showed a slightly lower logistic contrast between patch types, which could also be linked to a trend of lower SR. For SR, the positive effect of grazing is considered to be strongest in productive grasslands .

In this study, we did not find evidence for effects of grazing intensity on logistic contrast and subsequently on SR. In a grazing experiment with horses in an upland region in France, Clearance et al. compared paddocks of two different stocking rates (“high” 1.8 LU ha 1 year 1 vs. “moderate” 1.1 LU ha 1 year 1) and likewise found no effects on species richness.

On the other hand, van Link et al. 2016 found higher plant species richness under higher stocking rates in a grazed salt marsh system, although the stocking rate in their “intensive” grazing regime was quite low (1.1 LU ha 1 year 1) compared the range of stocking rates observed in horse husbandry . We therefore conclude that horses create a patchy structure of the sward and a distinct logistic contrast irrespective of the grazing intensity.

Study Limitations Our analyses are based on plant species data, since their presence and frequencies provide essential information on the growing conditions . Beyond vegetation data, other ecosystem characteristics need to be included to provide a complete assessment of the sustainability of grassland management with horses.

In spite of a relatively high average SR, some studied paddocks had little diversity and showed larger areas of bare soil, grazed areas with only a few species and rather high numbers of federal or stress-tolerant species, which is obviously a result of overgrazing. Studies by Soccer et al. (2013) and Lean et al. (2009) have demonstrated that regional conditions should be taken into consideration to address conservation issues.

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The results presented here should therefore be handled with care if conclusions for an appropriate conservation management in a wider spatial context are to be drawn. While grazing intensities in our study varied strongly among horse-grazed paddocks, we are aware that in the farming practice far higher stocking rates of horses, up to 10 LU ha 1 year 1, occur, especially in peri-urban regions .

It might be argued that the horse-grazed paddocks in our study had been established on sites of initially higher species diversity and that the observed grazer species effect is therefore due to site conditions or grassland management apart from grazing. While we do not have information about the vegetation before the present grazing system was established, all studied paddocks were managed in the same way for at least five years.

Most of the studied paddocks had been grazed by the same grazer species and not been renovated for decades and the vegetation can therefore be assumed to be in a state of equilibrium with the current management regime. Our study therefore demonstrates that it is possible to manage and maintain grasslands of a relatively high diversity through horse grazing, compared to grasslands managed in the context of dairy production.

In Germany, 15–20% of the total grassland area is managed by horse keepers, in some regions it is up to 30% . These data underpin the potential role of horse husbandry for the maintenance of species-rich grasslands.

Due to their patch-grazing behavior, horses are generally considered as a more difficult grazer species than cattle. Several authors stress that horse grazing is associated with environmental risks.

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Our study did not confirm increasing risks, at least not in relation to the nature value of the horse-grazed grasslands. In particular, continuous grazing with horses led to a pronounced logistic contrast within paddocks, and species richness at paddock scale was strongly related to this heterogeneity.

Our study demonstrated the potential of horse grazing to maintain species richness of temperate grasslands. This will then provide a basis for a more targeted grazing management with horses for the benefit of species rich grasslands in temperate climate.

data curation, A.S.; formal analysis, A.S.; funding acquisition, A.S.; methodology, A.S. and J.I. Anja Schlitz’ work has been funded by the German Federal Environmental Foundation (DBU) as part of the PhD-Fellowship Program (AZ 20012/175).

We gratefully thank the German Federal Environmental Foundation (DBU) for funding within the PhD-Fellowship Program. We thank M. Komischke, A. Summer and C. Riemann for their help during fieldwork, B. Town for her help on the manuscript and L. Ratcliffe for English language editing.

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Influence of Highland and production-oriented cattle breeds on pasture vegetation: A pairwise assessment across broad environmental gradients. In Open Source Geospatial Foundation Project ; Version 2.6; CGIS Entwicklungsteam: Brighton, UK, 2014.

A new practical tool for deriving a functional signature for herbaceous vegetation. Measuring Biological Diversity ; John Wiley & Sons: New York, NY, USA, 2013.

et al. Col linearity: A review of methods to deal with it and a simulation study evaluating their performance. Mixed Effects Models and Extensions in Ecology with R ; Statistics for biology and health; Springer Science & Business Media: New York, NY, USA, 2009.

Lime, S.; Richter gen. Zimmermann, A.; Hoffmann, M.; IJsselstein, J. Soccer, S.A.; Pratt, D.; Boch, S.; Müller, J.; Baumbach, H.; Hockey, S.; Hemp, A.; Scoring, I.; Wells, K.; Bus cot, F.; et al. Interacting effects of fertilization, mowing and grazing on plant species diversity of 1500 grasslands in Germany differ between regions.

Basso, S.; Thompson, K.; Phoenix, G.; Sloan, V.; Leave, J.; Sees, M. Long-term nitrogen deposition depletes grassland seed banks. Also, O.; Tóthmérész, B.; Element, A.; Simon, E.; Mile, T.; Lukas, B.A.

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Took, P. Environmental factors driving seed bank diversity in alkali grasslands. Well stein, C.; Otto, A.; Wildcard, R. Impact of site and management on the diversity of central European music grassland.

Plant species responses to cattle grazing in music semi-natural grassland. Menard, C.; Duncan, P.; Clearance, G.; Georges, J.-Y.

Lila, M. Comparative foraging and nutrition of horses and cattle in European wetlands. Board, G.; Salmon, K.; Malinowski, I.; Helen, D.; House, J.; Jongepierová, I.; Located, P.; Monica, O.; Vicar, J.; Cherry, M. Management of semi-natural grasslands benefiting both plant and insect diversity: The importance of heterogeneity and tradition.

Dull, R.; With, V.; Werner, W. Zeigerwerte on Planned in Mitteleuropa, 3rd ed. The LEDA Trait base: A database of life-history traits of the Northwest European flora.

Lean, D.; Kohler, F.; Bald, A.; Battery, P.; Concepción, E.D. Cough, Y.; Díaz, M.; Gabriel, D.; Holzschuh, A.; Know, E.; et al. On the relationship between farmland biodiversity and land-use intensity in Europe.

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Triplet design with six paddocks at one site grazed by cattle (C) or horses (HC, HR), three subplots and one transect per paddock © Orthophotographs provided by Land NRW . Triplet design with six paddocks at one site grazed by cattle (C) or horses (HC, HR), three subplots and one transect per paddock © Orthophotographs provided by Land NRW .

Box plots present median, 1st and 3rd quartile and outliers of target variables. Lower case letter indicates significant differences between grazing systems obtained within the minimum adequate models (see for remaining variables and effect sizes) at significance level p < 0.05.

Descriptive statistics of site factors, grassland management and soil chemical parameters. Variables were tested for differences between grazer species (LM, Turkey).

Descriptive statistics of site factors, grassland management and soil chemical parameters. Variables were tested for differences between grazer species (LM, Turkey).

Results of the multi model inference for the effects of grazing regime, grassland management and site factors on vegetation target variables. As target variables species richness (SR), the number of observed HPV species (Invest), proportion of competitive strategy component (BC) and federal strategy component (or), utilization values and logistic contrast (Sorenson) were tested.

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(Source: thehorse.com)

Grassland management is represented by average stocking rate, nitrogen (N) fertilization and mowing, abiotic site conditions by size (ha), slope, soil pH and phosphorus concentration. Model averaged coefficients (chef) of explanatory variables remaining in the 95% confidence set of submodels are shown in the remaining columns along with relative importance values (I) and significance levels (P) obtained by z-statistics shown as * p 0.05, ** p 0.01, *** p 0.001.

Results of the multi model inference for the effects of grazing regime, grassland management and site factors on vegetation target variables. As target variables species richness (SR), the number of observed HPV species (Invest), proportion of competitive strategy component (BC) and federal strategy component (or), utilization values and logistic contrast (Sorenson) were tested.

Grassland management is represented by average stocking rate, nitrogen (N) fertilization and mowing, abiotic site conditions by size (ha), slope, soil pH and phosphorus concentration. Model averaged coefficients (chef) of explanatory variables remaining in the 95% confidence set of submodels are shown in the remaining columns along with relative importance values (I) and significance levels (P) obtained by z-statistics shown as * p 0.05, ** p 0.01, *** p 0.001.

Grazing SystemGrassland ManagementAbiotic Site ConditionsHCHRStocking Rate FertilisationMowingHaSlopepHP 2 O 5 Species VariableInter-ceptcoefIPcoefPcoefIPcoefIPcoefIPcoefIPcoefIPcoefIPcoefIPSR52.0812.04 1 ***4.60× 1 ***2.550.577.48 0.98 **HNV-SR5.483.34 1 *** 0.99 ***1.81 0.87 1.77 0.90 *%C0.410.02 0.83 .0.010.01 0.72 0.68 0.010.01 0.79 1 ***0.010.490.03 1 ***%R0.400.000.340.000.002 1 *** 0.83 0.0010.250.02 0.98 **Grazing6.390.06 0.66 0.1460.28 0.99 ***0.070.480.100.550.000.260.28 0.96 ** 1 ***Trampling6.330.110.500.0910.23 0.97 **0.020.320.13 0.69 0.99 ***0.020.330.36 1 ***Forage6.900.27 0.87 *0.1140.08 0.657 0.110.56**0.22 0.83 0.050.420.13 0.75 **0.040.37×0.3 0.97 **Sørensen0.710.063 1 ***0.058***0.0060.390.000.270.0140.540.000.250.04 0.96 **0.010.500.000.26 Table 3. Grassland ManagementAbiotic Site ConditionsGrazing SystemStocking Rate FertilisationMowingHaSlopepHP2O5Species VariableFPFPFPFPFPFPFPFPRm 2 SR17.6<0.0013.50.0626.9<0.00114.9<0.0010.31HNV-SR14.9<0.00120.7<0.0015.40.0213.9<0.0010.31%C4.<0.00133.2<0.0010.31%R16.2<0.0017.60.00710.280.0020.19Grazing3.10.0413.8<0.00111.9<0.00115.4<0.0010.24Trampling2.70.0711.7<0.0011.10.2917.7<0.00122.6<0.0010.30Forage8.8<0.0016.50.0111.20.0016.70.0111.20.0010.24Sørensen9.4<0.0014.© 2020 by the authors.

However, grazing can be the final trigger for the painful and debilitating disease laminates which is why grass intake needs to be carefully monitored and managed especially for those most at risk. Quite simply, only those horses and ponies that aren’t showing any signs of laminates currently, are not overweight and that don’t have an underlying metabolic problem such as Equine Metabolic Syndrome (EMS) or Paid, are the lowest risk but if they are naturally good doers and therefore likely to gain weight easily, the amount of grass they have access to is still likely to need to be restricted.

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The problem with grass is that it is an abundant source of sugar and energy and it is hard to know how much your horse or pony is consuming. For many leisure horses and ponies, grazing on even average pasture can provide way more energy than they require resulting gain and obesity which predisposes them to laminates.

Then, consuming a lot of sugar from the pasture on a particular day, means a tipping point is reached that results in laminates. Levels of WSC in grazing vary according to grass species and environmental conditions, and so are very difficult to predict.

If you are concerned about their weight or their risk of laminates, then you should also try to avoid grazing them at times when environmental conditions indicate that WSC levels could be elevated or when there is lots of grass available that will inevitably increase their intake. The question of ‘when’s the best time to graze a laminates prone horse?’ is a tricky one to answer as in practice water-soluble carbohydrate levels are very difficult to predict.

However, even grasses that are typically low can accumulate high levels of WSC given the right environmental conditions and so it is important not to just assume your horse will be safe. Avoid grazing conditions where there is lots of light, but it is cold such as bright, frosty winter mornings.

Drought and overgrazing can both result in higher levels of WSC in the pasture as the grass is unable to grow and use its energy stores. Ideally pastures should be regularly cut or grazed to maintain them in the actively growing stage as this uses WSC.

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(Source: www.alltech.com)

Unlike ruminants, such as cattle, horses are limited in their ability to utilize forages that are low in nutritive value. Therefore, forage production for horses demands a higher level of management than is generally required for other livestock operations.

Forage nutritive value is determined by chemical analysis for crude protein, digestibility, and minerals. These include choice of forage species, stage of maturity when harvested, and soil fertility.

Forages have historically been evaluated on physical factors that include color, leakiness, maturity, smell, softness, and purity. By far, the largest single factor that affects forage quality is stage of growth at harvest or plant maturity.

The only sure way to determine forage quality is by submitting a sample for chemical analysis from a reputable laboratory. Stage of maturity may be the single most important aspect of management relative to forage nutritive value.

This is due to an increased level of both cell wall (fiber) contents and indigestible lignin, most notably in warm-season grasses. Harvest schemes for hay should be timed to obtain an optimum quantity of forage of acceptable nutritive value.

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For additional information on basic forage and pasture fertility see Extension Fact Sheet PSS-2225, OSU Soil Test Interpretations. If soil fertility is low and the grazing and harvest management is incorrect, these should be addressed before using additional pasture improvement practices.

If the forages are not adapted to the site or are undesirable, then methods for pasture renovation or reseeding should be considered. For additional information on renovation and reseeding practices see Extension Fact Sheet NREM-2581, Seeding Marginal Cropland to Perennial Grasses.

Based on the yield goal for specific forage crops, written recommendations for the level of each fertilizer nutrient required are furnished to the producer by the laboratory conducting the analysis. Nitrogen is second only to moisture in relative importance for maximum plant growth and is positively correlated with both dry matter production and crude protein (Table 2).

Although the data in Table 2 is specific to bermudagrass performance, most grass species respond similarly. Proper application of nitrogen fertilizer is generally a good investment in forage production systems.

Numerous research studies have shown that forage legumes have the ability to provide the equivalent of 50 to 200 pounds of actual nitrogen per acre to other non-nitrogen-fixing plants under good growing conditions, thus reducing the need for nitrogen fertilizer. Other nutrients such as phosphorus, potassium, and sulfur are applied as required to be based upon the soil test recommendations.

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Many producers, therefore, apply crushed limestone (lime) to increase soil pH to enhance nutrient availability for optimum forage production. Close attention to basic soil fertility fundamentals will ensure the dry matter production and forage nutritive value desired by horse owners.

Lack of attention to basic soil fertility will result in the producer purchasing more off-farm-produced feed and forage, decreased animal performance, and a reduced level of profitability for the enterprise. For first time establishment, check with your County Extension Educator to determine which forage species are adapted to the soil and climatic factors present at your location, then choose accordingly.

Typically, the combined use of cool-season and warm-season forages will result in the lowest cost to feed a horse on a year-round basis. Introduced warm-season grasses will require nitrogen fertilization to produce the quantity of forage and nutritive value that is desired.

Bermuda grass, if managed properly, can produce large quantities of dry matter, can have high nutritive value that results in good animal performance, can tolerate considerable abuse, and responds well to nitrogen fertilizer. The Old World blue stems are another group of perennial warm-season introduced forage grasses that are best adapted to clay or finely textured soils, especially west of Interstate 35.

Old World blue stems are somewhat more sensitive to trampling and overgrazing than bermudagrass, but can respond well to nitrogen fertilizer and produce large quantities of dry matter with good nutritive value under proper management. Weeping love grass, another warm-season perennial grass, is used on sandy soils, but its rapid growth generally requires rotational stocking following an annual late winter burn if it is to remain high in nutritive value.

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(Source: thehorse.com)

Crabgrass is generally higher in nutritive value and digestibility than bermudagrass or the Old World blue stems, but typically will not produce as much dry matter during the growing season. A higher level of management that involves attention to grazing pressure and tillage practices is also required to ensure a good stand of crabgrass each year.

Forage sorghum and the sunglasses are generally not used because of the occurrence of cystitis, a malady that occurs under grazed conditions. Alfalfa is the most universally utilized legume hay fed to Oklahoma horses.

If grazed, it appears that rotational stocking may provide for extended stand life. Alfalfa, like most other legumes, is generally higher in crude protein, digestibility, and minerals when compared to grasses.

Small grains such as wheat, rye, oats, barley, and/or rye grass are used as cool-season forages for horse pastures. But even in mixed plantings, horses stocked at heavy rates may preferentially consume other forages at first and wind up grazing pure alike stands.

Most frequently, mares on endophyte-infected tall rescue suffer from galactic (decreased milk production). A high incidence of stillborn foals is also associated with mares grazing endophyte-infected tall rescue.

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(Source: www.wideopenpets.com)

Unlike cattle, the neophyte toxicity problem cannot be diluted with clovers in the pasture mix or by the use of grain rations. Besides the cystitis problem noted previously, members of the genus Sorghum, such as sunglasses or johnsongrass, may contain Prussia acid, which can cause muscle weakness, urinary tract failure, neural degeneration, and death.

The problem with mares grazing endophyte-infected tall rescue has been noted in the prior section. Read Extension Fact Sheet PSS-2072, Blister Beetles and Alfalfa for more information on management of this pest.

Common reports include many ornamental shrubs, nightshade, locoweed, and pea vine, but any plant known to cause problems in other livestock species will probably affect horses. A software tool to assist producers in evaluating costs of forage production is available at www.agecon.okstate.edu/budgets.

Many recommendations on expected animal performance are based on subjective observations because formal research is lacking. Mares have adequately maintained body condition through late gestation on a solid, dense stand of wheat pasture when forage is unlimited, but accurate performance data is limited.

Generally, proper fertilization and grazing management is necessary if improved pastures are expected to provide required levels of nutrients to any class of horse. How well other needs are being met, such as protein and minerals, requires a more detailed knowledge of the horse’s needs and expected amounts in the forage.

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Historical records relative to precipitation, dry matter production, and fertility inputs provide valuable information that enables producers to make sound decisions regarding stocking rate adjustments and whether to plan to purchase off-farm sources of hay. Sound grazing management strategies consider both animal performance and resource conservation.

There are several management strategies available to improve animal distribution and the harvest efficiency of forage that is produced. Manipulation of livestock to achieve management goals generally results from the use of either continuous or rotational stocking.

Too heavy a stocking rate will result in decreased animal performance, forage stand life and the profitability of the enterprise.

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