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Friday, October 27, 2023Contact: Shannon Luce (859) 224-2716
The Jockey Club Releases 2023 Report of Mares Bred Statistics

The Jockey Club today released Report of Mares Bred (RMB) statistics for the 2023 breeding season. Based on RMBs received through October 18, 2023, The Jockey Club reports that 867 stallions covered 26,597 mares in North America during 2023.

The Jockey Club estimates an additional 2,500 to 3,500 mares will be reported as bred during the 2023 breeding season.

The following table shows the number of covering stallions and the number of mares bred over the past 10 years in North America as reported to The Jockey Club by mid-October for each year.
 
  2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
No. of stallions 1,698 1,547 1,449 1,423 1,342 1,214 1,134 1,067 1,016 925 867
Mares Bred 34,174 34,540 34,627 33,746 31,863 30,274 29,218 27,970 27,829 27,163 26,597

RMB statistics, sortable by stallion, mares bred, or state, for all reported stallions in 2023 are available through the Fact Book section of The Jockey Club’s website at jockeyclub.com.

Kentucky traditionally leads North America in Thoroughbred breeding activity. During 2023, Kentucky’s 199 reported stallions covered 16,953 mares, or 63.74% of all of the mares reported bred in North America. The number of mares bred to Kentucky stallions increased 1.58% compared with the 16,689 reported at this time last year.

Of the top 10 states and provinces by number of mares reported bred in 2023, in addition to Kentucky, stallions in New York, Ontario, and West Virginia covered more mares in 2023 than in 2022, 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 2023 and includes Oklahoma and Indiana, which were included in the top 10 in 2022:
 

State/Province
2022
Stallions
2023
Stallions
Pct. Change 2022
Mares Bred
2023
Mares Bred
Pct. Change
Kentucky 196 199 1.53% 16,689 16,953 1.58%
California 99 83 -16.16% 1,781 1,593 -10.56%
Florida 59 57 -3.39% 1,495 1,454 -2.74%
New York 38 37 -2.63% 973 1,085 11.51%
Louisiana 52 58 11.54% 842 789 -6.29%
Maryland 26 25 -3.85% 741 566 -23.62%
Ontario 25 27 8.00% 530 543 2.45%
Pennsylvania 25 19 -24.00% 398 363 -8.79%
West Virginia 24 29 20.83% 305 363 19.02%
New Mexico 39 35 -10.26% 378 349 -7.67%
Oklahoma 38 30 -21.05% 401 308 -23.19%
Indiana 39 29 -25.64% 496 281 -43.35%
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.

Golden Pal had the highest number of mares bred in 2023 with 293, followed by Epicenter (262), Practical Joke (252), Jack Christopher (247), and Uncle Mo (234).

There were 14 stallions with a book size of 200 or more that covered a total of 3,213 mares in North America in 2023 as reported through October 18, which is 12.1% of all coverings reported. The 45 stallions with books of 150 or more covered 8,588 mares, which is 32.3% of all mares reported bred. For comparison, reports submitted by October 10, 2013, show that one stallion covered more than 200 mares in North America, which represented 0.6% of the total for that year. Those reports also show 19 stallions covered 150 or more with a total of 3,205 mares in the 2013 breeding season, which equates to 9.4% of all mares reported bred in 2013 as of October 10.

The following table shows the number of stallions that covered 200 or more mares and the number of mares bred by those stallions in North America as reported to The Jockey Club by mid-October of each year.
 
  2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Stallions covering
≥200
Mares
1 3 4 4 4 5 8 12 12 16 14
Mares bred by Stallions covering ≥200 Mares 210 609 850 880 884 1,124 1,841 2,720 2,601 3,463 3,213

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 equineline.com/ReportOfMaresBred.

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 (americasbestracing.net), the broad-based fan development initiative for Thoroughbred racing, and in partnership with the Thoroughbred Owners and Breeders Association, operates OwnerView (ownerview.com), the ownership resource. Additional information is available
at jockeyclub.com.