I am a veterinarian in Atlanta with a special interest in behavior. I also own and raise Arabian horses. I have a 2 1/2-year-old stallion, and I would like to keep him in a harem situation. He is now pastured with another gelding and is quite socialized to other horses. Recently, he bred a very experienced older broodmare, who did a great job "patiently educating" him.

What has research told us about stallion behavior in a "natural" husbandry situation? Will these stallions become more aggressive or difficult to handle? (I would like to use this horse as a riding horse, and he is currently very easy to handle.)

Is it possible to keep a gelding at pasture with a stallion and his harem? Also, is there any research on using Regumate to prevent pregnancy in mares long-term? I’d greatly appreciate input and ideas.