Quantitative Evaluation of Limb Conformation in Various Age Cohorts of Thoroughbreds

An ideal horse should possess a limb conformation that enhances athletic capabilities and adjusts to varying loads. The structure of the limbs greatly influences a horse's performance and overall success. The study aimed to identify the limb conformations of Thoroughbreds across various age groups through quantitative assessments. Limb conformation data were captured from the front, left side, and rear of the horse using simultaneous photographs. Simultaneous photography ensured that snapshots of the horse were consistent, with no variations between photographs caused by movement. The limb conformation of 137 Thoroughbred horses was assessed recording measurements of limb length, and angles at ages 6, 12, 18, 24, 36, and 48 months. From 6 to 36 months, the heights of withers and croups increased consistently, with the most significant growth occurring within the first 24 months. Forelimb length saw notable increases from 6 to 24 months in both genders, but the growth between 24 and 48 months was not significant. The angle of the front fetlock was straightest in the 6-month-old group, decreasing to mature levels after 12 months. The findings indicate that the croups of horses were higher than their withers across all assessed ages, potentially altering the horse's center of gravity and placing more stress on the forelimbs. The ratio of distal extremity lengths to total leg length increased with age.