To fill you in a little, in July we got a 4 yr. old reg. quarter mare. Did not show heat for 2/3 months. Then look out! She came in heat! It is running clear to her fetlocks and she darn near sits down, even showing heat to us! If you ask her to back up or anything, she screams, pins her ears, kicks both hind legs breaking stall boards, etc. We are not beginners and have stood 3 studs, breeding outside mares, etc. for years! The second day we had her she attacked me over the stall door and really messed up my arm as I reached up to pet her face. Any ideas what is happening here?
There are several likely possibilities that may be causing this effect:
You may be seeing a submissive behavioural trait, not estrus. Some mares will posture in submission as though in estrus, but then when the "threat" to which they are behaving submissively doesn't stop, they will become aggressive in defence;
The mare has a uterine infection that is causing discomfort;
The mare is in discomfort relative to ovulation.
My bet would be the first option, but I would look at the others if that doesn't seem likely.
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