We purchased a 7 year old maiden mare that was bred this year for the first time, to the best of our knowledge. We tracked one dominate follicle and inseminated her. Ovulation went like clockwork.
Found 15 day pregnancy via ultrasound which looked fine.
At day 28 post ovulation, found a heartbeat and we sent blood for progesterone test. Results were received from ANTECH Diagnostics was reported as 10.1 ng/ml. We ran similar tests on all of the other mares this spring and this number is considerably higher than any of them.
After checking via ultrasound again today, we can only see one vesicle with a heartbeat visible.
So I suppose my question is...Is 10.1 high enough to be concerned about the possibility of a second pregnancy we are missing?
Progesterone is not produced by a pregnancy. It's produced by the Corpus Luteum (CL) or multiple Corpora Lutea on the mare's ovaries, so there would be no correlation between a high (or low) level and a multiple (or singleton) pregnancy.
So it is not true that a high progesterone level may indicate twins. I was told that it did...guess you can hear anything.
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