stallion book size

Jockey Club To Consider Limiting Stallion Book Size To 140 Mares

The Jockey Club board of stewards, concerned with the narrowing of the diversity of the Thoroughbred gene pool, announced its consideration of a rule to limit the annual breeding of individual stallions starting with the 2021 breeding season. The Jockey Club, established in 1894, is the keeper of the American Stud Book and maintains the […]

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