I have a mare that was ultrasounded in foal at 14 days and palpated at 32 days - still in foal. I noticed a little discharge so we ultrasounded again at 34 days - No foal and a huge 60mm follicle. Culture came back clean so we waited for her to come back into heat to rebreed. 3 weeks now and nothing. I have read that mares that go 35 days in foal (which she may have been) will often not return to normal heat cycles for 120 days yet my vet seems perplexed as to why she is not cycling. Do I need to seek another opinion? Will a lutelize shot bring her back in? I don't want to wait another 3 months before I can rebreed.
Posted on Monday, May 21, 2001 - 10:45 pm:
Around day 35 to 40 some structures called the "endometrial cups" grow in and start secreting a hormone called "equine chorionic gonadotropin" (eCG) which cause the production of secondary CL's that result in elevated progesterone levels. It is because of this that the mare will not re-enter estrus until about day 120, when the endometrial cups will regress.
Sometimes treating a mare with multiple doses of prostaglandin (of which Lutalyse is one brand name) over a period of several days may result it regression of the secondary CL's, but it has a low level of success.
I have a mare I tried to breed 3 years ago and the vet said she absorbed the embryo. This happened twice. Is this what she had also and can it be fixed because I would like to breed her this spring.
Posted on Monday, March 11, 2002 - 08:59 pm:
She actually aborted. However, at the early stage of pregnancy it is not seen.
There is a number of things that you can do to help insure that she retains the pregnancy. Ask your vet about using Regumate during the first 90 days of pregnancy. It really depends on when she lost the pregnancy. More imformation is needed to give you any helpful insight.
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