book size

The Jockey Club Officially Adopts Rule Limiting Stallion Book Size To 140 Mares

The Jockey Club board of stewards today announced that it has adopted a final rule limiting the annual breeding of individual stallions. The rule reflects The Jockey Club's goal to preserve the health of the Thoroughbred breed for the long term and will apply prospectively to stallions born in 2020 or later. Effective today, The […]

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