Mares will reach puberty at 12 to 15 months of age. Stallions are considered to have reached puberty when an ejaculate contains 1 x (10 to the eighth) total sperm with a progressive motility of 10 percent. The mean age for this to occur has been found to be 67 weeks of age.
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This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.
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