The Jockey Club's Report of Mares Bred (RMB) statistics reflects that through Oct. 18 of this year, 867 stallions covered 26,597 mares in North America during the breeding season, a decrease from 2022 when 925 stallions covered 27,163 mares, the organization said in a release early Friday.
They estimate an additional 2,500 to 3,500 mares will be reported as bred during the 2023 breeding season.
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.
Golden Pal, standing at Coolmore America, had the highest number of mares bred in 2023 with 293, followed by Epicenter (Coolmore), 262; Practical Joke (Coolmore), 252; Jack Christopher (Coolmore), 247; and Uncle Mo (Coolmore), 234.
Sires With 200+ Mares Bred:
Golden Pal (293)
Epicenter (262)
Practical Joke (252)
Jack Christopher (247)
Uncle Mo (234)
Olympiad (228)
Charlatan (223)
Cyberknife (223)
Justify (222)
Vekoma (212)
Mandaloun (211)
Nashville (204)
Yaupon (202)
Not This Time (200)
The RMB also shows that 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 Oct. 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 Oct. 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 Oct. 10.
Click here to view all of the RMB statistics, which can be found in The Jockey Club Fact Book.
In addition, RMB information on stallions that bred mares in North America is available through report 36P or subscription service Equineline.
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