Study Shows Horses Relax In Presence Of ‘Their’ People

An Italian study has objectively shown that horses can recognize individual people familiar to them, highlighting the importance of handler familiarity in the horse-human bond. Horses are generally relaxed when hanging out with humans they know.

Drs. Chiara Scopa, Alberto Greco, Laura Contalbrigo, Elisabetta Fratini, Antonio Lanatà, Enzo Pasquale Scilingo and Paolo Baragli noted that horses can determine if a person is familiar or unfamiliar by both vocal and visual cues. Horses are most likely to engage with someone who is familiar to them; they form long-lasting memories of these people and can recognize them long after their last encounter.

Horses then classify humans based off the interactions they have as either positive, negative or neutral. The research team noted that though the human-horse relationship has been investigated though behavioral analysis, they recommended that physiological indicators be considered for an objective assessment of emotional responses.

They hypothesized that long-term, positive relationships with humans would impact a horse's emotion regulation. The team looked specifically at heart rate variability of 23 healthy horses when they interacted with both familiar and unfamiliar handlers.

The team used 22 people, 12 of them familiar to the horses and 10 unfamiliar people. A baseline heart rate was taken before each person entered the stall and stood near the door for five minutes. The horse could see and smell the person, but could move around. The person then groomed the horse for 2.5 minutes on each side.

The researchers found that the horses appeared more relaxed while physically interacting with familiar handlers; this was especially noticeable during right-side grooming. They concluded that repeated positive interactions with a person are probable triggers for positive emotions during interactions with the same person.

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You Scratch My Back, I’ll Scratch Yours

Mutual grooming, where two horses groom each other's back and withers with their teeth, is usually done by horses that are familiar with one another. Drs. Masaki Shimada and Nae Suzuki of Teikyo University of Science studied a group of nine horses that lived in a protected area of Cape Toi. They wanted to determine if mutual grooming was used as a parasite removal tool, a way to strengthen friendly relationships or as a way to restore troubled relationships.

The duo monitored the nine horses for 33.5 hours over 15 days, applying models to learn about the roles of aggression, kinship, proximity, social rank and social networking during mutual grooming.

All nine horses groomed themselves during the study period for nearly 36 minutes. Six of the horses engaged in mutual grooming: two stallions, one colt and three adult mares.

There were 84 recorded mutual grooming sessions, with the average session lasted about 85 seconds and always comprised only two individuals. The grooming was almost completely symmetrical: When one horse started grooming, they almost immediately began receiving grooming as well, on the same part of the body. When one horse stopped grooming, the other did as well. Additionally, horses that spent less time self-grooming spent more time being groomed by another horse.

The scientists concluded that mutual grooming assisted in strengthening familiar relationships and helped with parasite removal. Their findings did not support that mutual grooming assisted with relationship repair. For example, the top-ranked horse never groomed the second-ranked horse, but he did direct aggression toward him.

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