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Multiple Follicles

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 2 » Multiple Follicles « Previous Next »


Author Message
 

Linda
Neonate
Username: Rylolin

Post Number: 5
Registered: 01-2008
Posted on Sunday, May 29, 2011 - 11:57 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi Jos,

I have an old mare that has a follicle progress then when you think ovulation might be coming, it regresses and another starts to develop. Does that sound like something normal?

Second, a friend of mine has an older mare that has multiple follicles (don't know if this is the same thing or not) and has been advised that she is not worth breeding now but should be watched over the summer/may be breedable in the fall.

Can you discuss the multiple follicle issue in older mares (if they differ from younger ones!).

Thanks,
Linda
 

Jos
Board Administrator
Username: Admin

Post Number: 3260
Registered: 10-1999
Posted on Sunday, May 29, 2011 - 04:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

There are a couple of possibilities on mare (1). She might still be transitional; you might just be catching her at a tie when mid-cycle follicles are regressing (mares produce follicles during diestrus that may regress or ovulate); she has abnormal hormone levels (in particular LH) which are interfering with her ability to ovulate.

If mare (2) is ovulating, unless there is something else involved, there is no reason why she should not be bred. The seasonally highest degree of fertility is about now.
 

Linda
Neonate
Username: Rylolin

Post Number: 6
Registered: 01-2008
Posted on Monday, May 30, 2011 - 10:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you for your input Jos!

Can we run blood tests for the hormone levels (what should we include?) and at what point in her cycle should we do that?

If you have a mare with multiple follicles in May why would waiting from May to sometime in the fall possibly resolve the issue? Is there a timing period that m.f. might die down? Wouldn't you just get yourself closer to normal seasonal anestrus timing?
 

Jos
Board Administrator
Username: Admin

Post Number: 3264
Registered: 10-1999
Posted on Monday, May 30, 2011 - 10:25 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

About the only practical reproductive blood assay would for progesterone, which if a level >1 ng/ml was returned would indicate that she was in fact ovulating. You may need to perform this weekly for three weeks in a row to confirm lack of ovulation (once you have an elevated level, you can stop testing as it has confirmed ovulation).

Have you checked the mare for the possibility of Cushing's/Pre-Cushing's syndrome? That can sometimes cause issues related to reproduction and might be worth checking.

There would be no reason to wait from May until Fall. Mares produce multiple follicles all the time when they are cycling. I would in fact be extremely surprised if I were to ultrasound a mare and find only a single follicle on her ovaries at any time during her cyclical phase! As I noted above, right now is the most fertile period of the year for mares as it's the height of the natural breeding season.
 

Linda
Neonate
Username: Rylolin

Post Number: 7
Registered: 01-2008
Posted on Monday, May 30, 2011 - 10:46 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you, I will give this some thought. I know I have more questions but will think it through to be more focused. Is there any other reading on this you would recommend to me?
Have not checked for C/P-C, she has no symptoms nor family history of it. Perhaps prog. check + Cushings check would be the next move.

Linda



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