The Jockey Club Considers Rule Regarding Breeding Stallions
As has been widely reported, the size of the North American foal crop has diminished significantly, from 37,499 in 2007 to the 20,500 estimated for 2020. | Photo: Anne M. Eberhardt/The Horse
The Jockey Club board of stewards, concerned with the narrowing of the diversity of the Thoroughbred gene pool, today 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 Principal Rules and Requirements of the American Studbook in order to ensure the welfare of the Thoroughbred breed.

As has been widely reported, the size of the North American foal crop has diminished significantly, from 37,499 in 2007 to the 20,500 estimated for 2020.

In 2007, 37 stallions reported in excess of 140 mares bred each from a total of 3,865 stallions. By 2010, that number had declined to 24. Since then, the number has nearly doubled to 43 stallions reporting 140 or more mares bred from a population of stallions that now stands at less than one-half that of 2007

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