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When will her next cycle be?

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 2 » When will her next cycle be? « Previous Next »


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Dorthy Brown
Breeding Stock
Username: Dodib

Post Number: 403
Registered: 04-2006
Posted on Monday, February 22, 2010 - 09:06 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok I had a prebreeding exam done on my mare that is to be bred. It was done on Feb 12th. Had culture/etc done. Ultrasound etc done. Was told she is in transition--had many small eggs but was told none will probably get big enough to breed on this month. Also culture/cyt was negative. Was told she looked good and that I could probably breed her next month. Well my question is if when we went in she was in transition with many small eggs-- how long before her next cycle? Should I count out 21 days and bring her to the stud just prior???
Also the letter I got from the vet said uterine tone was poor to fair---what does that mean? Is that a bad thing? He didn't mention it while I was at the vet office
 

Jos
Board Administrator
Username: Admin

Post Number: 2731
Registered: 10-1999
Posted on Monday, February 22, 2010 - 10:04 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If the mare was transitional, it means that she is not cycling yet. Hence you cannot predict when the next cycle will be (there not having yet been a cycle). About the only reliable way at this stage to determine when she will be ready to be bred is to identify an ovulation per ultrasound. To try and pinpoint another cycle after that, you can expect the onset of the next estrus to be approximately 14 days after the previous ovulation. Without having identified that ovulation you cannot predict the timing of the onset of the next estrus.

Uterine tone during diestrus is normally poor, as there is not progesterone circulating in the mare (which is produced by the CL which forms after ovulation). That therefore merely confirms that the mare is - at best - transitional.
 

Dorthy Brown
Breeding Stock
Username: Dodib

Post Number: 404
Registered: 04-2006
Posted on Monday, February 22, 2010 - 10:56 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Oh Ok thanks--so they can be in the transitional phase for several months???
I guess I thought transition meant they were "starting" just not ovulating yet, thats how the vet made it sound. Do they always have follicles?
 

Jos
Board Administrator
Username: Admin

Post Number: 2733
Registered: 10-1999
Posted on Monday, February 22, 2010 - 12:00 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Transitional phase occurs between winter anestrus and the regular cycling period of the year (hence the name - "transition"!). This can indeed last several months, and the end of transitional phase is indicated by the first ovulation of the season. During transitional phase, mares can have prolonged periods of receptivity to a stallion if teased (indeed, they will usually allow themselves to be bred when receptive), but are anovulatory (not ovulating) and consequently are not fertile. Ovarian condition during transitional phase is typified by multiple small follicles, usually under 3 cm in diameter. It is the estrogen secreted from those follicles that causes the receptivity to the stallion.
 

Dorthy Brown
Breeding Stock
Username: Dodib

Post Number: 406
Registered: 04-2006
Posted on Monday, February 22, 2010 - 12:30 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks..... so my best bet will be to get her ultrasound again next month to see where she is at.....
 

Jos
Board Administrator
Username: Admin

Post Number: 2734
Registered: 10-1999
Posted on Monday, February 22, 2010 - 05:04 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You could do that or you could start doing your own progesterone assays if you know how to draw blood from your horse and it is legal to do so where you live. If progesterone levels are >1 ng/ml that indicates that your mare has ovulated (and is therefore through transitional phase and into the regular cycling period of the season).



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