According to Dr. Ryan Ferris, in a podcast on TheHorse.com, a stallion's fertility usually peaks around 12 to 15 years of age, and drops a bit after that, and again after age 20. Horses are individuals, of course, and any given stallion may have excellent-quality semen even at an advanced age - another might have poorer-quality semen when young.
The podcast is part of TheHorse.com's series "Get Ready for Equine Breeding Season!" from their Ask TheHorse Live Q&A program. Click here to learn more, and to listen to an excerpt from the podcast.
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