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How to induce heat....

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


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Amy (Unregistered Guest)
Unregistered guest
Posted From: 64.231.30.108
Posted on Friday, December 30, 2005 - 09:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a mare due Feb 4 and am really wanting to breed her back on her foal or 30 day heat. I am in the cold climate of Canada and have not out her under lights as of yet as this was a decision I just recently made. Am I too late to start her under lights to expect her to come into a foal heat? Can you use Estrumate or other products like this to induce a heat when a mare would usually be in anestrus? Any ideas would help! Thanks!
 

Jos
Board Administrator
Username: Jos

Post Number: 10393
Registered: 10-1999
Posted on Friday, December 30, 2005 - 10:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

It is possibly worth putting her under lights, but generally it takes 60-90 days for an effect to be seen.

The mare will quite possibly have a "foal heat" but then re-enter winter anestrus. Follicles are produced close to foaling, but then the hormonal resurgences required to keep her in estrus will not be present after then if there is not the requisite phototropic stimulation (light effect).

Prostaglandins will not work in a mare that is not regularly cycling. You could possibly try using GnRH and/or dopamine antagonists, but the effect is not as good in colder climates.

(Message edited by Jos on December 30, 2005)
 

Amy (Unregistered Guest)
Unregistered guest
Posted From: 64.231.30.108
Posted on Saturday, December 31, 2005 - 04:16 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Do you have an article on GnRH a/o dopamine antagonist use on this sight? Or could you tell me more about them?
 

Kim k
Breeding Stock
Username: Kimk

Post Number: 197
Registered: 04-2005
Posted on Saturday, December 31, 2005 - 09:41 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Amy,
it is from our experience that it is possible to start light therapy and be successful. You must have enough light present to help the natural process and even if you were to miss the first cycle it should help with the second come the endo of feb or the first part of march instead of having to wait until april or may depending on weather on the amount of natural light where you live. It seems for us here in NOrthern indiana that the amount of light is very slow to come by this year. We actually looked at the sunrise time today and it isn't posted to change for 3 days ? Seems sortta odd. The nighttime set time is getting later by 1 minute per day at this time for us.

Good luck
Kim
 

Jos
Board Administrator
Username: Jos

Post Number: 10395
Registered: 10-1999
Posted on Saturday, December 31, 2005 - 12:43 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If you do a search on Google you will find lots of references.



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