I had a similar problem when I purchased a mare. My gelding (who's been a gelding since 2) decided he was a stud when she came in heat. He would bite and jump on her, but never did anything more than that. He would basically get up there, look around and go... hmm. Not sure what happens next... and hop off.
I started her on Mare Magic and its been a 180 degree turnaround. The two peacefully coexist and I don't have any more embarrassing displays in the pasture.
There are a couple of mare supplements out there you might want to try. I tried several before I found the one that works for us.
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