I have a 15 yr Arabian I'm trying to breed AI. Bred her in April, no pregnancy. Bred her in May, had 15 day US yesterday and there was no embryo and no follicle on either ovary, small folds started. On her 16 day US last month she had a 38mm follicle and she bred very well. She has no infections and is breeding sound. He gave her a shot before each breeding to get her to ovulate. Vet will be out Monday to US again.He is very confused, said she should have caught on last breeding without a doubt. He said sometimes, very rarely, the pregnancy can be to small to detect right away, can this be true? She is not showing any signs of coming back into heat yet, which is odd, she advertises her heats.Does this happen often? Why would there be no follicles showing on her ovaries if she is not in foal? I guess I will know more after Mondays US, but if anyone can help me out, maybe lift my spirits alittle, that would be awesome.
Things with horses are never ever concrete. What happens one time will more than likely not happen again. Sure your mare's pregnancy can be later than the days you have, I had a mare this year ovulate and get pregnant 4 days after breeding. So it is always rule of thumb never a concrete rule.
Trust me when I say you are not alone We have had a really tough year getting mares in foal. My own mare has been bred four times! She is healthy and breeding sound. We have several other mares that have had good luck after their third breeding.
In regards to your questions - Yes sometimes if the mare ovulates late, the pregnancy will be small and hard to find and yes it is pretty common (at least with my own experiences). Five times this season I have had mares checked at 14 days that still had a "CL" and no sign of pregnancy, unfortunately when each mare was rechecked two days later it was confirmed that they were not in foal. Good Luck!
I had Jrishha checked again today, 19 days, and still nothing. Still old CL on right ovary, left ovary is shrinking. The vet thinks she may have a false pregnancy, but he wants to check her next week again before we needle her into heat. He has had a mare this year show nothing at 14 and 18 days and after 21 she had a pregnancy that was the size of 14 days. So, there is still hope, I'm keeping my fingers crossed. At least I know she wants to be pregnant now.
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