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Breeding after CL and prostaglandin

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 2 » Breeding after CL and prostaglandin « Previous Next »


Author Message
 

carole whelan
Nursing Foal
Username: Milmom

Post Number: 14
Registered: 05-2007
Posted on Thursday, August 30, 2007 - 01:18 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

My mare was checked again, 47 days post insemination, and definitely not in foal, but never came back into heat either. I read your article on prostaglandin (very helpful-thank you!)and have a couple questions. The mare still has >30mm follicles. Can these be the same one seen on the last US? If so, is there an advantage to running her through a cycle to get rid of"old" follicles and develop new ones, or are my chances of a pregnancy just as likely if I try to breed off this first post CL cycle? How accurate is the 2-4 day ovulation estimate for the already well developed follicles. Is the reduced 2dose protocol appropriate for CL, just as when doing the P & E?
 

Jos
Board Administrator
Username: Admin

Post Number: 1540
Registered: 10-1999
Posted on Friday, August 31, 2007 - 10:02 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

At this stage, a lot is going to depend upon if your mare was pregnant, and when she lost the pregnancy. If she was pregnant and lost the pregnancy after about day 35, then it is unlikely that she is going to come back into estrus no matter what you do. Once the endometrial cups form at around day 35, and start secreting eCG, you will have the presence of multiple secondary follicles that either ovulate or luteinize and become secondary CL's. It is also worth considering that this pattern in the pregnant mare is what you appear to be seeing even though you have not found a pregnancy...

Mares also have mid-cycle (diestrus) follicles. It is possible therefore that what you are seeing is a cluster of mid-cycle follicles. There would be no need to do anything about those follicles, which are a natural occurrence, and which will either regress or become dominant and ovulate of their own volition.

1/10th of the standard dose of a prostaglandin product is all we routinely give, as it avoids the unpleasant side-effects seen with a full dose. This is discussed in greater detail in the article about monitoring and manipulating estrus (follow that link to access it).

A CL is formed whenever a mare ovulates, so I am a little unclear what the concern is about the "chances of a pregnancy... if I try to breed off this first post CL cycle". What you have present are perfectly normal ovarian structures.
 

carole whelan
Nursing Foal
Username: Milmom

Post Number: 15
Registered: 05-2007
Posted on Friday, August 31, 2007 - 11:10 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Sorry, Jos. I should have made that more clear. This mare was inseminated following P & E regimen. Timing seemed good. She has never come back into heat, was U/S at 15 days and 32 days, multiple >30 follicles present both times, no endometrial folds both times, but vet felt sure mare was not pregnant. I wanted further confirmation before using lutalyse. At 42 days post insemination, vet palpated, says definately not in foal, so I think it really must have been very EED and retained CL. Hence my question above. I wondered if these follicles are the same ones seen on prior checks, and if so, does that matter, ie, should I get rid of "old ones" (as recommended by one person), or just proceed as during any other recycling?
 

carole whelan
Nursing Foal
Username: Milmom

Post Number: 16
Registered: 05-2007
Posted on Friday, August 31, 2007 - 11:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Correction - vet palpated at 47 days, not 42.
 

Jos
Board Administrator
Username: Admin

Post Number: 1551
Registered: 10-1999
Posted on Wednesday, September 05, 2007 - 03:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Without reference to the prior ultrasonic images and the position of the follicles, there is no way to determine if these are the same follicles observed previously, or a new follicular wave. Indeed, even with the prior images present to refer to, it might still be difficult to determine.

I'd follow the follicles that are present, and see what happens. She may merely be not demonstrating estrus, but actually ovulating, and being missed because of the lack of behavioural responses.



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