My 8 year old QH mare foaled this year but did not breed back.I was told she would not develope a large enough follicle to breed on.They kept giving her prostaglandin so I'm assuming she was cycling(right?)or why would they keep giving it to her?What should I do this winter to prepare for next year.Can I do a progesterone test now or not?Should I put her under lights or wait.This mare had the same problem 2 years ago and would not breed.Thanks
Posted on Monday, November 18, 2002 - 11:21 am:
I'm not sure I understand what happened with your mare - size of the follicle has little to do with whether it is pre-ovulatory or ovulatory. I know some vets like to say, "you've got yourself a nice big fat 38mm" -but guess what? I've had mares ovulate off a 24mm follicle as many times as I've had them ovulate off a 45mm follicle and all points in between. The question is not how big is the follicle, but what does it feel like, where is it located and at what point is it pre-ovulatory?? and while there is nothing like an u/s to help aide in determining where a mare is in her cycle - a good old fashioned rectal palp can tell you loads more about what is going on with that follicle.
In any event, two suggestions - get yourself a qualified equine reproductive vet and put the mare under lights at least 75-90 days prior to when you want to see her first heat cycle. Don't worry about not having a teaser, just watch for signs, she'll squat, wink and flash at a wall when they are manipulated into coming into heat.
As soon as you get her cycling - get the vet out while she is in heat - and get a culture/cytology done and then treat her appropriately if necessary. If not, count your days (15 off after she goes out of heat) and breedable within 5-6 days after that (days 20 -21).
As for PG'ing your mare - prostaglandin, short cycling, lutalyse -whatever you want to call it, somebody doesn't know what they're doing. The only way for Prostaglandin to work is if there is a CL. The only way to get a CL is for a follicle to ovulate. So, if someone is telling you your mare is not ovulating off her follicles, and then shooting her up with Lutalyse, its not going to bring her back into heat - unless she has a CL, which she can only have if she ovulated off her follicle. And then, too, when using Lutalyse, the timing has to be impeccable to bring a mare back into heat - the mare has to ovulate off a follicle, a CL has to be created, and you have to wait at least 6 days after that to give the mare the lutalyse - and then within 3-5 days, she should be breedable.
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