I personally would not fed Regumate to my stallions during show season. It is a FEMALE hormone. You might check the archives on equine rero, but I believe it is strongly discouraged. Cindy Moore}
Regumate was researched as far as its effect on stallion sexual behaviour and found to have a reducing effect in younger stallions but little or no effect in older stallions where the behaviour was primarily learned and not solely hormonal.
Long-term effects of Regumate on stallions has not been heavily evaluated as the concept of using this female hormone in a male is a relatively new one. Early research results however indicate that long-term use may have a permanent suppressive effect on sperm production and libido.
I would not recommend using Regumate in a stallion with which it is intended to breed. If he's not breeding material, he should be castrated anyway to take away any temptation from the human more than the horse. If he is badly behaved enough that one is considering chemical manipulation rather than good handling, one should also be giving serious consideration about whether this is a temperament that one wants to pass on to subsequent generations.
Thanks, Just was wondering. I went to a show a couple of weeks ago, not with my stallion, but was listening to others talk about a stallion that was misbehaving and the conversation was that the owner or trainer should have him on regumate. They said he would act like a mare. Then I started looking at all the stallions that were being handled by trainers and you know they did act like mares, I don't know if it was training or chemicals but it was interesting.
I know a trainer who shows a lot of stallions, and they behave beautifully. Her "secret" is what she calls "testicle parties"! If a stallion starts to act up, she discreetly reaches, grabs, and gives a hard squeeze until he looks back, acknowledges her, and straightens up. One or two "parties" is usually all it takes, and her stallions behave very well! (Note: I'm NOT recommending this!) The point for me is that she trains them from a young age and never lets them forget who's boss, so they behave because of training rather than medication.
I'm guessing this "trainer" doesn't ever have to look forward to washing the stallions penis prior to breeding or collecting semen or manually guiding the stallions penis into a mare or AV... if she were going to have to, she might twice before handling that portion of the anatomy in a negative manner - the repercussions are generally not good when it comes time to breed as most of these stallions will start to associate someone reaching back there with an unpleasant outcome and become at best defensive (and lose the erection and the desire to perform sexually) or at worst agressive (to protect the equipment!)...
One is also left wondering if the "trainer" (and I am using the quotation marks to emphasise sarcasm!) has a teenage son, and if she applies the same logic to him if he starts to act up in a teenage sexual manner - and if not (which she probably would not!), then why would she feel it's necessary to do it with a colt...???
Behaviour like this in the name of training gives good trainers (no quote marks) a bad name - there's no need for it. She should learn some more appropriate training practices, or go and work in a breeding shed with older stallions that have been badly handled like this in the past by "trainers"...
too funny, just picturing mothers across the US grabbing the "jewels" for a testicle party.....
i don't think i would grab my stallion in such a manner, he associates human contact on the genitalia as foreplay to sex. Or at the very least a warm washing.
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If a stallion starts to act up, she discreetly reaches, grabs, and gives a hard squeeze until he looks back, acknowledges her, and straightens up. One or two "parties" is usually all it takes, and her stallions behave very well! (Note: I'm NOT recommending this!) The point for me is that she trains them from a young age and never lets them forget who's boss, so they behave because of training rather than medication.
too funny, just picturing mothers across the US grabbing the "jewels" for a testicle party..... 
