I have run into a unique situation this year, that has been most frustrating for me. I have a 4 year old mare that has always been the sweetest creature alive. She reliably packs around my toddler children, has been the babysitter for weaned foals, and has never been the dominate mare in the pasture. She never shows any signs of heat unless around my stallion, at which point she acts like she is in heat 24/7/365. I actually left her in the corral with my stallion for over a month because I had no idea when she actually was in heat.
About a month after I removed her from the pen with my stallion, she turned VERY agressive. She's still good with people, and nice to ride, but she is downright dangerous to any other horse. She will mount mares that are in heat, and she's been rounding up any horses she can get to run, and keeping them pushed back away from people, and my stallion.
In the past, she has always been the "come running when a human is present" type, now you have to chase her down. I've resorted to putting her in hobbles, which makes it harder for her to chase the other horses (havent had any go thru the fences since doing that!) and she cant mount any of them either. My question is this: Could this sudden swing in attitude be a hormone problem caused by this pregnancy? She is now 6 months pregnant (confirmed by palpation), and has been behaving better, but that is largely due to being hobbled I think. Has anyone else had this problem? Will she get better or worse when she foals out? Does this happen with "first time" moms, and then things level out with pregnancies down the road? I cannot keep this mare away from the other horses, she cribbs normally, but has taken to breaking down fences to get to "her broodmares" since becoming pregnant. Therefore, just keeping her isolated is not the answer for my situation. Sad to say my stallion is easier to handle around other horses than this mare right now. I want to know if there is a cause that can be identified and eliminated here, or if I'm just better off spaying this mare and forgetting the whole ordeal. I cannot handle another year like this with her. The cost of fixing the fences, and patching up wire cut/wood cut horses is nothing compared to the strain on the nerves! But I had this foal sold before the mare was even bred (ironically because the people were so impressed by her wonderful attitude), so it would be nice to get more foals later on, but only if we can avoid repeating this disasterous year! HELP!! Has anyone else been thru this?
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