We have a quarter horse mare that is about 13 years old and has produced two foals. She started acting studdish early this spring. She runs up to other mares and sniffs them and snorts and has even tried to mount one of them a couple of times. We planned to breed her again this year and we did. We figured after she became pregnant the behavior would stop and she would mellow out, however it has become worse and she is even more aggressive despite the fact that she's pregnant. One other note: she's always been hard to get in foal but is fine once she catches and has normal pregnancy, she just never takes on the first or second breeding cycle but usually takes on the third. Does anyone have any idea what might be going on? We've talked to our vet and she has no idea. Any help would be appreciated since we've now had to separate her from the other mares and pasture her by herself.
Sandy Posted From: 18.104.22.168
Posted on Tuesday, October 05, 2004 - 11:22 pm:
Here is a response to another post:
I had a friend whose mare became very stallion-esque and ended up having a tumor or a large cyst on one of her ovaries. I couldn't say for sure if your mare has the exact same behaviors, but I would certainly have the vet check her reproductively.
The old timers say that your mare will have a colt,but in my experience my 23 yo mare does this every time she is in foal ,3 fillies/1 colt,I put it off to raging hormones,but you might be safe to have her checked by your vet.
At certain stages of pregnancy (from around 70 days on), the fetus secretes large amounts of steroids. One of the steroids it secretes is testosterone - both colts and fillies.
If you see a pregnant mare acting like a stallion, it doesn't indicate she's carrying a colt, it merely indicates that the fetus is secreting good levels of hormones!
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