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Discussion on Regumate for stallions
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New Member:
kellya
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Posted on Sunday, Nov 23, 2008 - 6:29 pm:
I am looking for any studies or research done on the reproductive affects of prolonged use of progesterone on a stallion to alter his behavior in the performance arena.
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Moderator:
DrO
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Posted on Monday, Nov 24, 2008 - 9:04 am:
Welcome Kelly,
I went to see if there is anything new since this subject has not been touched in 8 years and there is nothing new published in the literature on this question over what is published above. What are the particular details of your case?
DrO
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New Member:
kellya
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Posted on Wednesday, Nov 26, 2008 - 8:34 pm:
Dr. O
I have learned from a friend that her stallion's semen quality and count is considered to be worthless. He is a 10 yr old show horse and was given Regumate most of the time he was at shows, at a rate of 30cc/day to curb his stallion behavior. The horse was shown fairly heavy and has only 8 foals registered at this time. All foals were from live cover breedings. He has not had any Regumate for the last 9 months. Could the Regumate have caused these problems? KA
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Moderator:
DrO
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Posted on Friday, Nov 28, 2008 - 8:15 am:
Kelly, when you ask "could?", it is near impossible to say no because of all the variables.
However if you had asked instead, "is it likely?" you often hear reports of its occasional use in the adult stallion that remains fertile. We do know it may adversely effect some seminal parameters but the question is poorly studied and we do not know if there is a high enough dose used frequently enough that might cause infertility in some individuals.
DrO
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Member:
ekaufman
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Posted on Friday, Nov 28, 2008 - 10:48 am:
Hi Kelly,
First, kudos to your friend for showing her stallion. That takes a lot of commitment!
If the stallion has sired 8 foals, his semen is not worthless, unless something has changed since he last settled a mare. He may be sub-fertile, but he is evidently NOT infertile. What percentage of mares has he settled?
Of course, low motility semen typically has no commercial value, especially for cooled or frozen use. There's a lot of research in the area of improving semen quality, and your friend might be well served by consulting with her veterinarian and with a good stallion-side repro. specialist.
Diet and management changes can make a difference for some stallions (not all). I had marked improvement in post-thaw motility on my own stallion with specific dietary supplementation. If the stallion is valuable for breeding, it may be worth some investigation.
Good luck to your friend and her horse.
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