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Artificial Light and heat cycles

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 1 » Artificial Light and heat cycles « Previous Next »


Author Message
 

Suzanne
Posted From: 64.12.116.13
Posted on Wednesday, March 02, 2005 - 03:19 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

We put a mare off the track under lights the last part of November and she has yet to come into heat. She came home from Colonial Downs in July and was pulled off all race drugs then so there should be not after effect of those going on.

Our repro vet came two weeks ago to do a pre-breeding exam. He said that she had no CL indicating that she has not ovulated recently and that the two follicle she had were very small and her cervix was closed tight and tone was fair to good. He thought that she should be showing more signs with being under the light for so long. He thought that she may be coming into heat and asked us to tease her with our gelding (who by the way really enjoys this job!)but to no avail. She likes to talk to him but after a few minutes trots off in a snit.

Does anybody have any ideas about what could be going on with this mare. She is a stakes winner so we really want to get her covered early this season.
 

Jos
Posted From: 209.86.78.88
Posted on Wednesday, March 02, 2005 - 08:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Several things to consider:
  • Mare response to lights is not 100%;
  • If the lighting program was interrupted at any stage for 3 consecutive days you will have had to start again to see effect;
  • If the mare was on testosterone or other steroids at the track, it can take up to 2 years to get her system back into regularity - and some never recover;
  • While your gelding may enjoy his job, your mare may not appreciate his attention and not react to him by showing estrus. Not all mares will respond to any or all stallions, and attempting with a gelding can have a lower success rate yet;
  • The mare could still be in early transitional phase despite having been under lights and a single ultrasound may be insufficient to detect true status - checking her again in 7-10 days may show more follicles (if she is not still suffering from the effects of track drugs, and is respondig to the lights).
Or it could be something completely different...!!! :-)
 

Suzanne
Posted From: 205.188.116.13
Posted on Wednesday, March 02, 2005 - 09:15 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Jos, thanks so much for your help. I will schedule an appt to re-u/s. She is due to leave for MD and the breeding shed after the 14th of March regardless of her status. Northview, where she will be bred can handle the rest and hopefully she will come home in foal!



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