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First heat

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 1 » First heat « Previous Next »


Author Message
 

Sheryl Kress-Griffin
Neonate
Username: Sheryl

Post Number: 1
Registered: 04-2006
Posted on Thursday, April 27, 2006 - 06:17 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a two-year old quarterhorse mare. She's usually VERY affectionate toward me and wonderful to her pasture buddy. Last weekend, she seemed to be in a bad mood - she wasn't as affectionate and was nippy to her friend. I am wondering if she is old enough to be in heat? When is typically the first heat?
 

Jos
Board Administrator
Username: Jos

Post Number: 10622
Registered: 10-1999
Posted on Thursday, April 27, 2006 - 06:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Any time from 9 months of age onwards.
 

Sheryl Kress-Griffin
Neonate
Username: Sheryl

Post Number: 2
Registered: 04-2006
Posted on Thursday, April 27, 2006 - 10:23 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you! I'll bet that's what's going on! And, am I correct to assume that, because it's spring, it's an estrous heat? Maybe I'm naive, but is there a way to tell?
 

Jos
Board Administrator
Username: Jos

Post Number: 10624
Registered: 10-1999
Posted on Friday, April 28, 2006 - 12:58 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Clarification of terms:

Estrous = the entire cycle from ovulation to ovulation;
Estrus = "heat" = the portion of the estrous cycle when the mare is receptive to the stallion;
Transitional phase = the period between winter anestrous (no cycles) and regualr cyclicity;
Transitional estrus = displays of receptivity to the stallion during the transitional phase, which may or may not result in an ovulation after which ovulation the mare is considered out of transtitional phase and into the regular breeding cycle.

So, what you are actually (I think) asking is if it is a transitional estrus (or "heat"), and the answer is I can't tell you! It is towards the end of the time of year when mares are still transitional, so maybe, maybe not. One can tell, or at least get a good estimate, by using ultrasound, and evaluating uterine edema and follicular diameter, but beyond that there's no real way to know for sure if the mare is still transitional, unless of course a CL is seen per ultrasound on the ovary (in which case she's not still transitional).



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