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PREGNANCY AFTER REGUMATE FOR SHOW

Equine-Reproduction.com Bulletin Board » Hormonal Manipulation » PREGNANCY AFTER REGUMATE FOR SHOW « Previous Next »


Author Message
 

Lynne Cody
Posted on Thursday, February 15, 2001 - 11:57 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

We kept our show mare on Regumate last show season from about May until the last show in September, due to behavioural issues. We turned the lights out in September too.

She came into heat right after(maybe 4-6 days) after removal. I believe she may have cycled throught the fall--we don't have access to stallion, so we aren't sure.

Lights came back on 11/5/00. Put her back on Regumat on 12/24/00. Have kept her on due to early January big show...want to breed her ASAP.

(1) Does anyone think she'll be transitional? We have been diligent with lights & Regumate, never missing a day, so we think she won't be.

(2) How soon after removing Regumate should she ovulte? We are wanting to keep her at stallion station for as short a time as possible. Next show is April 20th, so we want to get her home & riding again. We are planning on taking her there on Monday, 2/19/01.

We understand there is no guarantee; however, we would like to know what others have experienced.
Thanks!
 

Jos
Posted on Tuesday, February 20, 2001 - 10:39 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

There needs to have been at least one ovulatory estrus which has produced an active CL secreting progesterone in order to establish regular estrus, so although you have put the mare under lights, by putting her on Regumate before an ovulatory estrus occurred, you may be no further ahead.

Regumate use in transitional phase mares will stimulate the development of a larger follicle, but once treatment is withdrawn, the subsequent estrus may return to a typical (irregular) transitional phase.

If you are fortunate, the mare will enter estrus 3 to 5 days after withdrawal of the Regumate and ovulate 5 to 7 days after that, but as I say, there are other factors that also come into play and the use of the Regumate prematurely may have a negative effect.

If you find that the mare relapses into transitional phase, with no ovulation (and therefore pregnancy) you might like to contemplate the use of progesterone and estradiol, which has a somewhat stimulatory and regulatory effect.

Good luck!



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