I have a 19 yo mare who has had several foals in the past. Hasn't had any in a couple of years, but as far as I know didn't have any problems in the past (hasn't been bred since I've owned her). I decided to breed her this year. Did a breeding soundness exam, all came out well. Waited till second cycle to take her to the breeders. They did an ultrasound to make sure she had ovulated and gave her a shot of Settle. Took her in at 14 days post service, vet said she was open. As of today she is 9 days past time for her to cycle again. I took her back in for another sonogram today, but vet said she is still open. But for the first time he said he saw a cyst in her uterus. Three different vets have checked her in the past two months, (breeding soundness exam, ovulation check, and two checks for a pregnancy) and this is the first time any have seen the cyst. Can it just appear that quickly? Or could it possibly be a pregnancy instead? Vet said he didn't know why she was so late. She had two very small follicles, one on each horn, and he said it would be another week or two before they could possibly be the right size for breeding. Any ideas why she would be so late? In the past she has had fairly regular cycles.
Breeder thinks I should have another ultrasound done four days from now (day 30), and if still saying not pregnant then to try and rebreed.
At this point I've spent way more money than I planned, and have nothing to show for it. I have no idea what to do next. Thanks for any advice.
While the conceptus starts to lose it's rotund shape around day 17 post-conception, you also have to consider that not all cysts are round!
By 23 however, a heartbeat should be visible to the trained eye per ultrasound.
There is also a situation that sometimes occurs where the conceptus changes shape, and continues to develop as though there was an embryo present, but there isn't (it is visibly lacking).
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