So Scary: Handlers Can Help Horses Overcome Fear Of Novel Objects

Polish researchers recently completed a study designed to help determine why horses are afraid of other animal species. Dr. Anna Wiśniewska and her research team focused specifically on cattle, which many horses seem terrified of.

Cattle and horses have traditionally lived together and were familiar with each other. In many modern operations however, most cattle and horses live separately, so they very rarely encounter one another. Horses kept in suburban areas may go their whole lives without exposure to bovines or other hooved animals. 

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When horses that are not used to cows are exposed to one outside of their familiar barn, they may act fearful and try to avoid the cow. The research team from the University of Life Sciences in Lublin, the University of Chester in England, and the Polish Academy of Sciences created a study to determine if horses were more fearful of cows than other novel objects. 

They created an experiment using 20 healthy riding horses; they put each horse individually in an arena familiar to them and exposed them to two different cows tethered in the space and a box on wheels. They also exposed them to nothing so they had a control. 

The arena was marked off in sections, with section one being closest to the cow and section three being furthest away. The researchers then measured how much time the horses spent at different distances from the cow, as well as the horse's heart rate. The horse's reactions were also recorded. 

Two months later, each horse was led either toward one of the cows or toward the box. The horse's heart rate was monitored. While loose, the horses avoided the area closest to the cow and the box; horses that were led became more fearful the closer they got to the cow and the box.

The results showed that the horses were as afraid or more afraid of the cow than a box. The scientists say this reaction suggests that the horse's fear of novel objects may also be a part of a horse's fear of unfamiliar species.

The team concludes that as prey animals, horses are sensitive to unknown and frightening stimuli, and they often act in fear despite years of domestication and selection against fearful behavior. This instinct to avoid fearful objects, living or not, may be exacerbated when the horse is restrained (in this case led toward the object). They also concluded that with handler support, trained horses can be easily habituated to objects they once found scary.

Read the full study here

Read more at HorseTalk. 

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Do Sedatives Affect Lameness Exam Outcomes?

Lameness exams on high-energy horses can be difficult to complete, especially if they involve joint or nerve blocks. Occasionally overly exuberant horses must be sedated for the exam to be performed to keep both horse, handler and vet safe. Concerns have been raised that sedating the horse may mask a horse's pain response, and potentially compromise the results of the joint or nerve block and the exam.

A group of Brazilian veterinarians tested the effects of xylazine and xylazine used in conjunction with butorphanol on induced hind-end lameness. Drs. Antônio Alcemar Beck Júnior, Flávio Desessards De La Côrte, Karin Erica Brass, Stéfano Leite Dau, Gabriele Biavaschi Silva and Marina de Aguiar Camillo compared the results of the sedated horses to the results of a control group of horses that did not receive sedation.

The researchers used 16 horses and placed metal clamps around their hoof wall with small screws. The screws were tightened to induce lameness until the horses became a Grade 3 or 4 (out of 5) on the AAEP lameness scale. This was done immediately before the administration of sedation.

Each horse received all three treatments: no sedation, xylazine alone or a combination of xylazine and butorphanol. The scientists concluded that xylazine used alone or in conjunction with butorphanol (at the recommended doses) can be used as chemical restraint without masking lameness intensity. They note that additional research must be done to determine how detomidine and romifidine might interact with butorphanol during hindlimb lameness evaluations.

Read more at EquiManagement.

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