My mare foaled on 04/18/10 came into heat six days later, and her foal heat only lasted TWO days. According to my math, she should have gone back into heat during the last week of may. Yesterday 05/16/10 she came back into a STRONG heat. Today, she seems less interested... I'm concerned she may be on her way out again? Vet is coming out tomorrow to ultrasound to see where we are... would like to get her re-bred.
My question is, Could there be some reason why her cycles are shortened? last year when I bred her, she was in heat nine days... that was the norm for her... seven to nine days.
Curious to hear any information anyone has to offer? I'm sure the vet will be able to shine some light on the situation as well.
I was going to respond to this and then got called away and never got back... sorry!
If the mare foaled 04/18 and then showed heat for a couple of days 6 days later, those 2 days were probably the days she was closest to ovulation. It's not uncommon for mares with foals at foot to not display prolonged estrus, but just very close to ovulation. So... if that was the case, we can presume ovulation on or about 04/26. Allowing a 14 day diestrus period, that would mean that she would be likely to return to estrus (but may not show it) about 05/10 and - again using the presumptive - if she were in estrus for about 7 days, with an ovulation towards the end of that time, perhaps showing again only around the time of ovulation, that would mean estrus display approximately 05/16-17 - which is exactly when you posted the original question! In other words, she was indeed behaving precisely as one would predict.
Now however, you have thrown the proverbial wrench in the works ("spanner" for those outside the USA), with her being alleged to be ready to breed Thursday! So all of my above calculations are of no value... I hope!!!
You might want to confirm suitability of breeding on Thursday again, and remember that mares can have mid-cycle follicles...
oh no! haha. well, the vet was out and said he measured two follicles... one at 31 and one at 35mm. He is coming back tomorrow morning to re-check her again. He may give her a shot then, (of what, I can't recall... SO many different hormone shots...) but something to encourage ovulation. We will be breeding on Thursday evening, with hopes that she catches. (Live cover.) I will have to keep you guys posted in 15 days (will ultrasound at day 14) to see if we have a foal!!! Fingers crossed!
Ok, so not as easy as I thought. Today we did another ultrasound, to find a hemorrhagic follicle! we are giving her lutalyze (sp.) on Monday... hope that clears this up and we'll try again.
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