We have a mare that slipped her pregnancy last year (between 60 and 90 days). We assumed it was because she had a recto-vaginal fistula which we subsequently discovered had not healed totally (it was surgically repaired last fall and she's fine now). But this year, after she was bred, we pulled a progesterone level on her at 30+ days - it came back low, around 3, so we put her on Regumate. She's a big mare (1500+ lbs open), so she was getting 15cc a day. We checked her three more times (at 2, 3, and 5 months) and each time her progesterone level was around 3. Due to the cost of Regumate, we cut her back to 10 cc after 5 months gestation. She is now 9 months, the foal is very, very active, and all looks well. We have slowly "weaned" her Regumate down to 5 cc a day, and now 2.5cc a day. I want to take her the rest of the way off. The vet says that there is no real evidence that Regumate after 5 months will help maintain a pregnancy, but that there IS anecdotal evidence of abortions in mares with low levels when taken off the Regumate. He left the decision up to us, and being a little on the anxious side, we decided to keep her on it.
Now my question - She's maintained this pregnancy on a 2.5 to 5cc dose for a few weeks now. As she's such a large mare, would such a low dose have any effect anyway? And if not, is it safe for me to assume that we can take her the rest of the way off? Or might the 2.5cc she's getting actually be helping maintain the pregnancy? Any input on this would be appreciated - I guess I'm just looking for reassurance that it's OK to stop the use of the Regumate altogether. TIA
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