Ok, so my 5 yr old draft mare doesn't show at all to our 8 yr old stallion, nor to our 2 year old stud colt, but we have figured out that she does show occasionally to other mares. I don't know if that is the same as "silent estrus". We AI everything, so with timing things right through shots, ultrasound, and then vet checked her at 14 days in foal, she has had only 2 confirmed pregnancies. But then we would check again later around 45 days "not in foal". We don't know what else to do or to try, except hormone testing. I got her at 4 with a pre-breeding exam and nothing out of the ordinary found. We have been trying to breed her ever since and I am about to give up. Any suggestions that don't cost a fortune?
The primary cause of pregnancy loss in the time frame you are describing would be endometritis. This can be as a result of pathogenic presence or non-pathogenic irritants such as uterine fluid. It would therefore be worth while having a uterine swab sample taken, with a culture and cytology evaluated (make sure to follow that link and read about why cytology is important), as well as ensuring there is not any uterine fluid presence before, during or after breeding - and I would suggest following an oxytocin protocol even in the absence of fluid, as it can often assist with other issues. If you want to do a little heavier-duty exploration, or if you still don't get a pregnancy maintained after doing the above, I would suggest a uterine (endometrial) biopsy with culture.
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