Off subject: Lutalyse
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Off subject: Lutalyse
Why would the breeding farm give my mare Lutalyse on 4/7 after she was bred on 4/3 ? I have never seen this before. I thought that Lutalyse would cause abortion.
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Derby Lyn
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From what I was always told, it would cause abortion. I can't think of any reason that they would need to give it then.
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lutaylce "lyces" the follicle, or gets rid of it, if it didn't get fertilized. they would use lutalyce to then rid her of the follicle that didn't take and short cycle her back in with probably regumate, to get her back into heat quicker to get her bred quicker instead of waiting till her next heat cycle. she probably missed her window of opportunity to take with this last breeding is why.
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Mood Swings
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Re: Off subject: Lutalyse
aurora wrote:Why would the breeding farm give my mare Lutalyse on 4/7 after she was bred on 4/3 ? I have never seen this before. I thought that Lutalyse would cause abortion.
Did you talk to the manager at the breeding farm that your mare is boarded at? Was your mare covered again within a few days of the injection? Is she now pregnant?
If they gave lutalyse after she was bred it leads me to believe that her follicle was not progressing as it should after she was covered. As a rule, after three days the semen would no longer have been viable. I am assuming she had not ovulated at this time. If she had ovulated and they gave her lutalyse then there is something fishy. Maybe they bred her to the wrong stallion
Kidding 
It could be as simple as a mix up with the secretary. I would call and find out though because it is a concern. Good luck!"People come and go but horses leave hoofprints on your heart"
It wouldn't have been effective anyhow. The CL has to be 5-6 days old for Lutalyse to work at all.
Lutalyse can also cause ovulation. From equine-reproduction.com
Full Article
Lutalyse can also cause ovulation. From equine-reproduction.com
If a follicle >3 cm is present at the time the prostaglandin F2α is administered, ovulation may occur in as little as 2-4 day
Full Article
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I got my answer from the vet:
The mare had a problem with accumulating uterine fluid post breeding. The dinoprost along with oxytocin will cause the uterus to get rid of the fluid before the embryo drops down into the uterus and is killed by the fluid. The action of the drug that you are questioning (i.e. lysing the follicle) is actually that the drug can "lyse" the corpus luteum which is partly responsible for maintaining pregnancy. It is the tissue that is left on the ovary after ovulation. This drug is not effective against this tissue until it is mature which would not be until later in the mare's cycle.
The mare had a problem with accumulating uterine fluid post breeding. The dinoprost along with oxytocin will cause the uterus to get rid of the fluid before the embryo drops down into the uterus and is killed by the fluid. The action of the drug that you are questioning (i.e. lysing the follicle) is actually that the drug can "lyse" the corpus luteum which is partly responsible for maintaining pregnancy. It is the tissue that is left on the ovary after ovulation. This drug is not effective against this tissue until it is mature which would not be until later in the mare's cycle.