I have a 21 year old mare that has had 10 babies plus. She has been teased everday for 30 days. SHe has a 4.0 folical but wont' show signs of heat, and her cervix is tight. I bred this mare last year. Very easy took the first time lost the foal at 180 days. She has been check for breeding soundness in April, and all came back normal. Oh, I did see if she would accept the stallion even thought I knew she woudln't was careful but no way did she want him.
Why isn't her cervix reacting? ugggh. I am going to short cycle her this week. I haven't had this happen before. Even my silent heaters cervix relaxes.
Diestrus follicles are very common, expecially in the height of the breeding season such as we are now. Follicular presence in the mare is not positively correlated to estrus, so it is essential that other features are also present before assuming that timing is correct to breed. Those other features include uterine edema visible on ultrasound, relaxed cervix, and of course (ideally) positive response to teasing by the stallion.
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