Here's the story: 3 mares taken to breeder in May. All confirmed in foal at day 16 and again at day 23. Brought mares home after this and rechecked around day 40. 2 of the mares had aborted. Mare one is a healthy 12 yo who had one foal, 4 years ago. Mare two is a 5 yo maiden TB who other than being slightly underweight is healthy. Hymen was intack at first breeding for mare two. Brought both mares back into heat and ordered shipped semen. Mare one was bred, concieved and still pregnant now. Mare two was bred right after ovulation, given shot of "settle" when bred and also IU antibiotics day after breeding. Mare concieved, was confirmed at 15 days and again at 24 days. I was late getting vet out for next check. Vet checked at 50 days, mare open and actually in heat, getting ready to ovulate within 24 hours. Mare is a silent heat mare, so I had not seen any signs from her. She is up to a great weight, leads a very stress-free life and actually has a very calm temperament for a TB and has good repro confirmation. Vet will be back out next week to do a culture and biopsy on her, but via ultrasound he said he hasn't seen or felt anything abnormal. Anyone have any ideas on why this mare may has no problems concieving, but has aborted both pregnancies? I know I won't know for sure until the culture/biopsy is completed, but was just wondering if anyone's gone through this before? Thanks for reading and sorry this was so long!
Why was mare 2 given Settle and antibiotics? There must have been some concern over her status/condition in order to use it - it's not a routine breeding treatment. Random use of these is both expensive and has potential for negative side-effects - particularly the antibiotics.
Unless the hymen was absolutely intact - typically evidenced as such by sterile fluid in behind it - there is still the possibility that there was a pathogen present in the uterus. Simply because she was a maiden mare does not mean there was no pathogen. The culture and biopsy is therefore a valid diagnostic tool to use.
There are a variety of potential causes for embryonic death, and one of the leading causes is endometritis. This can be as a result of a pathogen (as above) or even breeding-induced. Use of an oxytocin protocol post-breeding may be beneficial even in the absence of uterine fluid per ultrasound. It's cheap and often highly beneficial.
She was given the settle per my request, since she had aborted once already. I've heard a lot of good about it and vet said it is a good "precaution". Vet suggested the antibiotics. I wasn't thrilled with the idea, but figured that the vet knew better than me! Vet also wanted me to start mare on regumate after first embryonic loss, but this seemed really crazy to me for a 5 yo maiden. (I've since switched vets and am working with a specialist...) Oxytocin was used post-breeding. Thanks for the info anyway! I can't wait to do the culture/biopsy and see the results.
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