SummaryOver a three year period (1993, 1994, and 1995), a total of 350 Thoroughbred colts and 350 Thoroughbred fillies in Central Kentucky were weighed monthly on a portable electronic scale through 1B months of age. Wither height and cond tion score were also measured in about half of the foals. In order to estimate mature body size ln these horses, 472 brood mares were weighed 60 to 90 days after foaling. In addition, 25 Thoroughbred breeding stallions were also welghed. The average body weight of the brood mares equaled 570 kg and the average weight of the stallions equaled 580 kg. At 14 days of age, colts and fillies weighed an aveßge ol77.7 and 76.1 kg and had average heights of 107.3 and 106.3 cm, respectively. Colts were heavier and taller than fillies throughout the study and at 490 days averaged 9.9 kg heavier (427.8 kg vs 418.0 k9) and 1.6 cm taller {153.4 cm vs 151

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A grain-based glycemic response test may be a useful tool in identifying breeding farms where foals are at risk of developing OCD. Using this type of test to predict a predisposition for OCD in individual weanlings appears less promising. Feeding young horses a concentrate feed that has a high glycemic index may increase the risk of skeletal disease.

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