01-27-2012, 01:28 PM
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If both testicles are there, even if ONE is there, a horse is able to reproduce.
Personally, I don't like to keep any intact studs in with mares after 6 months of age unless I am hoping someone gets pregnant. And yes, in some cases they can reproduce that young.
Unless you are watching them 24/7/365 there is no way to know for sure that he hasn't already mounted her or if he will/will not mount her in the near future.