I have a gorgeous AQHA 7 year old mare that has had one foal. I bought her last year. We booked her to a stallion and shipped semen to her 3 times, could not get her in foal. Culture/cytology was negative and her uterus looks textbook on the ultrasound. Cycles were regular and ovulation was predictable at 48-52mm. We decided to hold her over until this year and try again.
Fast forward to this year. Mare under lights Nov. 1. First ovulatory cycle was in early January and again she ovulated at 48mm cycle on her right ovary. We planned to wait until her next cycle and breed her with fresh semen, AI onsite. Next cycle was also on her R ovary (thought that was strange), but we bred her with the raw semen, all went great. At 13 days we had a gorgeous, textbook pregnancy. Checked her again at 30 days and the pregnancy was gone. She also had a big 45mm follicle again on her R ovary. We thought perhaps she had lost the pregnancy early on and gave her another 21 days and planned to breed her again and start her on Regumate on day 4. 21 days later another big 46 mm follicle on her R ovary. Attempted to inseminate but her cervix is TIGHTLY closed. Is she stuck? Should we try Regumate 14 days and estrumate?
Thanks in advance for your insight! Suggestions appreciated!
I'm not completely clear what your concern is (other than no apparently pregnancy).
It is not in the least unusual that you are seeing follicles on one ovary rather than the other - although undoubtedly if you were to check her every cycle for an entire breeding season you would see variance. Follicles are slightly more common on the right ovary than the left.
Bear in mind too that mares produce follicles during diestrus, so what you are seeing may not be a product of the mare being in "heat" - which would also explain the tightly closed cervix.
If this were my mare, I would also check very closely for a pregnancy before doing anything invasive (like insemination) or chemical (like Estrumate) as you are now into the stage where a pregnancy can disappear over the pelvic brim and out of reach of the ultrasonographer and pregnancies do get missed - and remember that the second leading cause of anestrous is pregnancy!
Thank you Jos... I have never had a vet miss a pregnancy at 30+ days. In fact, I thought it would be tough to miss at that point. He had a clear view of her uterus and both horns, it looked like the 'wagon wheel' you see in the textbooks.
Regardless, hope she IS pregnant! Thanks for your insight.
It's rare that a pregnancy is missed that late, but it most certainly has happened more often than you cold imagine. You'll find tales of it on this bulletin board...
Having said that, your description of uterine edema per ultrasound is not encouraging of a pregnancy diagnosis...
I think what you need to do is (if she is not pregnant) start all over again. Breeding work-up with swab culture and cytology - or even biopsy and culture - careful evaluation of the cervix and reproductive tract; and then be prepared to breed in a timely manner and use the oxytocin protocol even in the apparent absence of fluid in the uterus - it can make a remarkable difference.
If that fails, revisit us and we can talk more!
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