Originally Posted by Juna
Deciding after 55 days of confirmed pregnancy would be too late to save the fetus, if indeed the mare was going to slip it due to low progesterone.
You are correct on that.
If your mare is confirmed pregnant at 14 days, then I would get her blood work done to see where her progesterone levels are at. Your vet can prescribe you on what to do from there with your own individual mare....but with our mare last year, she slipped her pregnancy at 30 days (which is right when they would slip if they have low progesterone. The CL on her ovary supplies the mare with enough progesterone they need to maintain pregnancy up until 30 days.
By fourteen days post ovulation, if the mare is pregnant chances are very good you do not need progesterone supplementation. But, the original ovulation and resultant CL are NOT sufficient to maintain a pregnancy through 30 days. The mare should be developing and having secondary CL's by that point. Think about it. If the mare is not pregnant, the original CL is resolving by around day 14 and by day 16 to 18, if there is no pregnancy, she is returning to estrus. If the mare needs supplementation, it should be initiated by no later than day 4 or 5 post ovulation to be effective if indeed the mare is truly a candidate for supplementation. Additionally, if you "are" going to supplement, use Altrenogest (Regumate or the injectable form from BET Pharm) as you can still test the mare and determine HER progesterone levels. It doesn't interfere with test results.
If their bodies aren't producing enough on their own after that day, then bye bye baby.) On the mare's next successful breeding we had to give the mare 10 cc of Regumate every day (starting at 20 days) until she was 150 days along (or was it 100? I can't remember. Lol) Then we pulled her off it and she is currently about to foal in the next couple days. |
120 to 150 days is correct. But, if your mare is pregnant at 20 days without supplementation, chances are she is fine on her progesterone levels. By 120 to 150 days the feto-placental unit is responsible for the production of progestins.
Hope that helps!
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