My mare was just US yesterday at day 36. Her vesicle appeared to be deflating with no clear sign of the embryo. Around day 15 she had a good vesicle and embyo. My vet was sure she was aborting so we decided to give her a Prostin shot then to beat the 40 day caps so we can try to rebreed. She had great tone still and had some small CLs. She hasn't done this before. She's 13 and has had 5 foals. She has caught on one breeding/ shipment her last 3 breedings, not sure of the prior ones. She had a colt 2005, was rebred on her foal heat, had a colt 2006, and chose to wait for her first real cycle this time. We had to work a bit to get her to cycle after her foal heat, presumably due to her foal at her side as she checked out clear. So, this being my first breeding problem, I want to better understand what might be going on and hopefully get some reassurance. My vet mentioned posible putting her on Regumate for the first couple of months this time, but now that I've read up on it, I'm affraid of causing her to need it from now on, as opposed to her actually needing it. Does addiction relate to length of use? Any other thoughts? Thanks.
There's a wide variety of reasons as to why a mare undergoes early embryonic death (EED), and to just reach for the Regumate after one failure is certainly not warranted (if you read the article about Regumate use on this web site, you're quickly understand that it's actually very rarely warranted!).
the leading cause for EED is endometritis (inflamation of the endometrium - lining - of the uterus). This can be caused by an organism (bacteria or yeast) or as a result of post-breeding inflammatory response that has not cleared. Especially in view of your mare's age and that she has had foals in the past, it wold be worth reading and considering the oxytocin protocol that we lay out on this web site. It's also a lot cheaper than Regumate!
It may though be somewhat academic for you. The endometrial cups are usually present by day 35/36, not day 40, so there's a very distinct possibility that she isn't going to come back into estrus for quite a while anyway...
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