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  Discussion on Lutalyse in pregnant mare
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Member:
Mftgirl

Posted on Wednesday, Mar 31, 2004 - 11:38 pm:

My husband's mare was vet checked NOT in foal last summer, palpation and ultrasound, by our regular vet's partner who was new out of school. At that time she would have been about 70 days. A week and a half ago, my husband thought he would breed her and since she hardly ever show signs of being in season, asked me to give her an injection of Lutalyse. I did, and while waiting for the sweating to occur, realized her belly looked fatter than normal. This mare is normally hefty, so when I mentioned it to my husband, he blamed it on that. He did however take her to the vet the next day and found that she was definately in foal with the head engaged. Our vet told us that the Lutalyse would have no effect this late in the pregnancy, and that we might have a foal in 72 hours because of it's position. My question is this - since she had only small bag development before the shot, and then developed a new full bag in two days, and has shown all the signs of being in labor ever since without her water breaking or having the foal, could this all be the result of the Lutalyse, or due to the fact that she is a maiden mare, and what should we expect? We are at 8 days sleeping in the barn. I should also say that she was pasture bred, in with the stud for about a month and a half so we don't have a good idea of her actual breeding date. Any info would be appreciated.
Moderator:
DrO

Posted on Thursday, Apr 1, 2004 - 7:35 am:

A single dose of Lutalyse is not considered an effective abortifacient in late term pregnancy but repeated doses have been recommended by some to induce abortions late term. I cannot find any case reports. So abortion may be possible and in experiments usually ocurs 3 to 4 days after the series is begun in midterm mares so you may be out of the danger time.

Though this information may be too late to be o use, altrenogest (Regumate) has prevented abortion in one experiment with mid-term mares administered Lutalyse.

Pregnancy checking a mare with no firm breeding date can represent a problem if a exam is less than optimum. There is a period between about day 90 and day 180 where the foal sort of "falls out" of the area easily palpated. After 180 he grows back into the area easily palpated. For more on this see Equine Reproduction » Breeding and Foaling » Pregnancy Diagnosis.
DrO
Member:
Mftgirl

Posted on Thursday, Apr 1, 2004 - 7:46 am:

Our best guess is that she was bred sometime between March 1 and May 1. So, since we are in that window now, it sounds like this may just be a maiden mare trying to confuse us. I guess we just need to keep waiting. Thank you for the information. I will definately look my mares over more closely before giving Lutalyse again.
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