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Figure S1 Body measurements collected for each horse.

Figure S2 Histograms of counts of horses by (a) age; (b) body condition score where 1 = extremely underweight, 5 = ideal condition and 9 = overweight; (c) muzzle profile where 1 = deeply dish-faced (muzzle seen in profile curves in), 3 = straight and 5 = strongly Roman nosed (muzzle seen in profile curves out); (d) degree of feathering on lower limbs where 1 = no feathering and 5 = copious feathering; (e) bite conformation where 1 = extreme overbite and 5 = extreme underbite; and (f) subjective assessment of skeletal thickness without consideration of the horse’s size, where 1 = a light, thin skeleton and 5 = a heavy, thick skeleton.

Figure S3 Coefficient of variation calculated for each measurement by breed. The boxplot central bar indicates the median breed coefficient of variation.

Figure S4 Scree plot of the proportion of variance explained by each of the first ten principal components from the PCA performed on the 1215 horses measured.

Table S1 Count of measured horses by breed and sex.

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