Dominance rank is associated with body condition in outdoor-living domestic horses (Equus caballus)

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Abstract

The aim of our study was to explore the association between dominance rank and body condition in outdoor group-living domestic horses, Equus caballus.Social interactions were recorded using a video camera during a feeding test, applied to 203 horses in 42 herds. Dominance rank was assigned to 194 individuals. The outcome variable body condition score (BCS) was recorded using a 9-point scale. The variables age and height were recorded and considered as potential confounders or effect modifiers. Results were analysed using multivariable linear and logistic regression techniques, controlling for herd group as a random effect.More dominant (p= 0.001) individuals generally had a higher body condition score ( p= 0.001) and this association was entirely independent of age and height. In addition, a greater proportion of dominant individuals fell into the obese category (BCS. ≥.7/9, p=0.005).There were more displacement encounters and a greater level of interactivity in herds that had less variation in age and height, lending strength to the hypothesis that phenotypic variation may aid cohesion in group-living species. In addition there was a strong quadratic relationship between age and dominance rank ( p

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Giles, S. L., Nicol, C. J., Harris, P. A., & Rands, S. A. (2015). Dominance rank is associated with body condition in outdoor-living domestic horses (Equus caballus). Applied Animal Behaviour Science, 166(1), 71–79. https://doi.org/10.1016/j.applanim.2015.02.019

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