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Summer heat & humidity

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 2 » Summer heat & humidity « Previous Next »


Author Message
 

Marilyn Lemke
Yearling
Username: Marilyn_l

Post Number: 65
Registered: 06-2007
Posted on Monday, August 06, 2007 - 08:26 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

This summer is so hot and humid, which makes me wonder if it can cause problems with pregnancy. Can it hurt a mare's chances of getting pregnant or keeping an early pregnancy?

I was thinking the heat could cause stress on the mare.
 

Jos
Board Administrator
Username: Admin

Post Number: 1483
Registered: 10-1999
Posted on Monday, August 06, 2007 - 10:07 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Texas A&M did some research a couple of years ago where newly pregnant mares were either exercised or not. The EED rate was higher in the mares that were exercised, which initially seems to suggest that working a pregnant mare is risky. That however is contrary to what has been seen in the past, and further review of the research indicates that it was very hot when the research was performed, so it may be that the core temperatures of the mares being exercised were increased, and that increase reached a level that impacted pregnancy maintenance. Certainly we know that if we overheat an embryo in the search dish under the microscope during ET's we can impact the subsequent survival rates once transfered, so it may well be that excessive heat can impact the embryo within the mare as well. The question is, "what is excessive heat"?
 

Lisa R.
Breeding Stock
Username: Lisa98

Post Number: 102
Registered: 02-2007
Posted on Monday, August 06, 2007 - 12:30 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Jos, would you have a link to the research at A&M?? Their findings are very troubling; I would be interested to know what the temps were when the mares were exercised and what the heat indices were as well. Seeing as that I live in Texas, with pregnant mares, this is very relevant to me. Thanks so much for your help and information!!
 

Jos
Board Administrator
Username: Admin

Post Number: 1485
Registered: 10-1999
Posted on Monday, August 06, 2007 - 10:36 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Mortensen C, Choi YH, Hinrichs K, Ing N, Kraemer D, Vogelsang S, Vogelsang M; (2006) Effects of exercise on embryo recovery rates and embryo quality in the horse; Animal Reproduction Science 94;395-397 - you can purchase a full copy of the paper at that link (there is unfortunately no abstract available). There is also a synopsis of the research and some of the results available on Dr. Vogelsang's project description web page. The research was also presented at the 9th International Symposium on Equine Reproduction.
 

Lisa R.
Breeding Stock
Username: Lisa98

Post Number: 103
Registered: 02-2007
Posted on Tuesday, August 07, 2007 - 02:01 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you so much!! I had already seen what was on Dr. Vogelsang's page, she was my favorite prof and I always look up her work-I'm a dork I know. I will check out the Symposium notes as well.

Thanks again for all that you do here-it's really wonderful!!
 

Marilyn Lemke
Yearling
Username: Marilyn_l

Post Number: 68
Registered: 06-2007
Posted on Tuesday, August 07, 2007 - 08:47 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you so much Jos. What would we ever do without your vast knowledge???



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