here's the scenario - young (about 5) warmblood maiden. she's pretty obese and has been dry lotted for 2 or so months to get her weight down and is being treated for some kind of thyroid condition, and she will NOT catch. on first AI this year, vet came out, palpated, said it was a 4.5+ and bred her on that day. then the next day returned and repalpated and said she had a big soft follicle and might even be ovulating at that moment or would rather immediately and bred her with the second half of semen. the semen is without question excellent in quality. on ultrasound today, the mare turns up empty. has a very large follicle on the same ovary with some spidery little things on it. vet said lutalyze in 6 days and try again. what's with the spidery little thing on her ovary? she didn't ovulate? could it be tied to her thyroid and obesity?
It sounds as though you might be dealing with an anovulatory hemorrhagic follicle - there are ultrasound images in that article for you to take a look at and compare.
As far as the mare not conceiving - there are a multitude of reasons OTHER than thyroid issues. While thyroid issues may be a problem, they are not that common in the equine, or at least not as common as some have believed in the past. I think I would start with a good breeding soundness examination by a veterinarian experienced in equine reproduction (preferably a theriogenologist).
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