Wondering if anyone has had some experience doing ET (young, healthy mare) on the foal heat. I recently took the CSU short course and regarding breeding on the foal heat they had certain perameters (10 or more days after foaling, reduced endometrial folds, no severe tissue damage sustained during foaling, clean culture). Several vets argue that you will NEVER get a clean culture on a mare on the foal heat, but that's another discussion. Anyway, I have a mare who is not due to foal till July 19th. The reason I am considering breeding on the foal heat is that it is known to be an extremely fertile heat.
Foal heat breeding has often been called a very fertile heat in mares, however one must also consider that substantially fewer live foal deliveries are the result of foal heat breeding versus breedings on subsequent heat cycles. The reason for this has been stated many times, that while the mare may be in a position to conceive, her uterine environment is not fully prepared to maintain that conception.
As with all reproduction, timing is all important. We as breeders are in a position that requires we take full advantage of that timing in order to maximize our chances for success. That success not being achieved until we have a full term live foal delivery, not just a conception.
Add to that equation ET and your realy in a delicate situation, loaded with the potential for failure.
Posted on Friday, April 20, 2001 - 11:41 am:
Recent research that used ET as a means of determining true fertility on the foal heat by the flushing of embryos actually indicated that foal heats are NOT as fertile as regular heats.
The theory previously was that pregnancy loss occured at a higher rate on foal heats, but the fact that fewer embryos were flushed on post-partum mares actually indicates this is not the case, but that fertility is genuinely lower.
Embryo recovery rates were 48% for post-partum mares; 71% for the control group. (Huhtinen et. al.; 1996)
J Bivin Posted From: 188.8.131.52
Posted on Friday, January 23, 2004 - 07:49 pm:
having flushed MANY mares on foal heat and other heats, i can say that embryo RECOVERY is lower on that heat, as well as embryo conception. The uterus is larger, the cervix is looser. This makes it mechanically difficult to rinse out every fold in the uterus and to not lose any fluid. We always used as a rule of thumb, that 50% conceive and 50% of those are recovered. So 25% overall. It does depend on age though. A smaller, rapidly shrinking uterus of a younger mare is better.
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