The Jockey Club Releases 2018 Report of Mares Bred Statistics
Monday, October 22, 2018
Monday, October 22, 2018 Contact: Alexa Ravit (212) 521-5307
The Jockey Club Releases 2018 Report of Mares Bred Statistics

The Jockey Club today released Report of Mares Bred (RMB) statistics for the 2018 breeding season. Based on RMBs received through October 16, 2018, The Jockey Club reports that 1,214 stallions covered 30,274 mares in North America during 2018.

The Jockey Club estimates an additional 3,000 to 4,000 mares will be reported as bred during the 2018 breeding season.

The number of stallions declined 9.5% from the 1,342 reported at this time in 2017, and the number of mares bred decreased 5.0% from the 31,863 reported last year. The number of stallions covering 125 or more mares increased from 60 in 2017 to 62 in 2018.

Further book size analysis shows a 3.0% increase in the number of mares bred to stallions with a book size of 125 or more in 2018 when compared to 2017 as reported at this time last year; a 1.4% decrease in mares bred to stallions with a book size between 100 and 124; a 7.0% increase in mares bred to stallions with a book size between 75 and 99; a 6.7% decrease in mares bred to stallions with a book size between 50 and 74; a 9.6% decrease in mares bred to stallions with a book size between 25 and 49; and a 16.7% decrease in mares bred to stallions with a book size fewer than 25.

The percentage of broodmares covered by large book size (125 or more) stallions increased from 29.4% in 2017 to 31.9% in 2018. From 2015-2017, this percentage had remained constant at approximately 29%, up from 20.5% in 2014.

The proportion of stallions with book sizes of 125 or more mares grew from 3.1% in 2014 to 4.5% from 2015-2017. In 2018, this proportion increased to 5.1%.
2014 2015 2016 2017 2018
% stallions with book size >125 3.1% 4.5% 4.5% 4.5% 5.1%
% mares covered by stallions with book size >125 20.5% 29.1% 28.7% 29.4% 31.9%
Note: Statistics summarized as of October 16 of the breeding seasons indicated in the columns above; as reports of mares bred continue to be received, final statistics are subject to change.

RMB statistics for all reported stallions in 2018 are available through the Fact Book section of The Jockey Club’s website

The stallion Into Mischief led all stallions with 245 mares bred in 2018. Rounding out the top five by number of RMBs were Cupid, 223; Klimt, 222; Practical Joke, 220; and, Violence, 214.

Kentucky traditionally leads North America in Thoroughbred breeding activity. During 2018, Kentucky’s 228 reported stallions covered 17,322 mares, or 57.2% of all of the mares reported bred in North America. The number of mares bred to Kentucky stallions increased 0.3% percent compared with the 17,275 reported at this time last year.

Of the top 10 states and provinces by number of mares reported bred in 2018, Kentucky, California, Maryland, and Pennsylvania stallions covered more mares in 2018 than in 2017, 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 2018:
State/Province 2017 Stallions 2018 Stallions Pct. Change 2017 Mares Bred 2018 Mares Bred Pct. Change
Kentucky 229 228 -0.4% 17,275 17,322 0.3%
California 137 137 0.0% 2,356 2,482 5.3%
Florida 92 78 -15.2% 2,073 1,917 -7.5%
Louisiana 93 80 -14.0% 1,235 1,125 -8.9%
New York 58 48 -17.2% 1,326 1,115 -15.9%
Maryland 30 30 0.0% 768 867 12.9%
Ontario 38 37 -2.6% 810 620 -23.5%
Pennsylvania 36 32 -11.1% 563 610 8.3%
Indiana 59 57 -3.4% 554 506 -8.7%
Oklahoma 54 43 -20.4% 537 470 -12.5%
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

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