The Jockey Club Releases 2020 Report of Mares Bred Statistics

The Jockey Club today (10-23-20) released Report of Mares Bred (RMB) statistics for the 2020 breeding season. Based on RMBs received through October 18, 2020, The Jockey Club reports that 1,067 stallions covered 27,970 mares in North America during 2020.

The Jockey Club estimates an additional 2,500 to 3,500 mares will be reported as bred during the 2020 breeding season.

RMB statistics for all reported stallions in 2020 are available through the Fact Book section of The Jockey Club’s website at

Kentucky traditionally leads North America in Thoroughbred breeding activity. During 2020, Kentucky’s 200 reported stallions covered 16,391 mares, or 58.6% of all of the mares reported bred in North America. The number of mares bred to Kentucky stallions decreased 4.3% percent compared with the 17,123 reported at this time last year.

Of the top 10 states and provinces by number of mares reported bred in 2020, stallions in Louisiana, Maryland, Pennsylvania, and New Mexico covered more mares in 2020 than in 2019, as reported at this time last year. The following table shows the top 10 states and provinces ranked by number of mares reported bred in 2020:

State/Province 2019 Stallions 2020 Stallions Pct. Change 2019 Mares Bred 2020 Mares Bred Pct. Change
Kentucky 220 200 -9.1% 17,123 16,391 -4.3%
California 124 103 -16.9% 2,018 1,766 -12.5%
Florida 81 73 -9.9% 1,863 1,721 -7.6%
Louisiana 79 74 -6.3% 984 1,017 3.4%
New York 43 37 -14.0% 1,058 1,002 -5.3%
Maryland 31 29 -6.5% 780 806 3.3%
Pennsylvania 28 37 32.1% 686 734 7.0%
Ontario 29 24 -17.2% 538 519 -3.5%
Oklahoma 38 40 5.3% 479 476 -0.6%
New Mexico 51 48 -5.9% 437 453 3.7%

Note: Each incident in which a mare was bred to more than one stallion and appeared on multiple RMBs is counted separately. As such, mares bred totals listed in the table above may differ slightly from counts of distinct mares bred.

In addition, Report of Mares Bred information on stallions that bred mares in North America is available through report 36P or a subscription service at

The Jockey Club, founded in 1894 and dedicated to the improvement of Thoroughbred breeding and racing, is the breed registry for North American Thoroughbreds. In fulfillment of its mission, The Jockey Club, directly or through subsidiaries, provides support and leadership on a wide range of important industry initiatives, and it serves the information and technology needs of owners, breeders, media, fans and farms. It founded America’s Best Racing (, the broad-based fan development initiative for Thoroughbred racing, and in partnership with the Thoroughbred Owners and Breeders Association, operates OwnerView (, the ownership resource. Additional information is available at

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