Enlarged superficial digital flexor tendons are not uncommonly observed in immature Thoroughbreds, and are a cause for concern amongst consignors and buyers at sale. Our data indicate that affected individuals are nearly as likely to race as their siblings, either at 2 or 3 yr of age. Although average earnings per start were less than siblings at 2 and 4 yr of age, average earnings per start were equal amongst subjects and siblings at 3 yr of age.
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