A friend of mine told me that her mare had a marble inserted in her uterus to simulate pregnancy. She said her mare is much calmer and easier to control around other horses. What is the name of this procedure and how safe is it?
This method has been used with extremely variable results.
The only problem is that if the simulation of pregnancy is not absolute, then the mare will still show estrus. When this happens, the cervix relaxes and the marble is "spit out" of the uterus (and the mare).
Worth a try, but no guarantees.
Oh - and it might also set up a tremendous uterine inflammatory response, which could also cause an return to estrus (with the relaxation of the cervix etc. etc.)
dear list I would know more about "glass-marbles":shape,material,size and so all. At what time of the estrus cycle could be inserted? does the uterus show a big reaction? does it create a capsule around the marble? How long the marble could remain in the uterus? does someone bred a mare after marble? thanks a lot giulia
Posted on Thursday, January 02, 2003 - 09:20 am:
A 30-35 mm diameter marble has been found to work the best. It is inserted by your veterinarian at the very end of estrus, after ovulation has been identified. Uterine reactions appear to have been minimal or nil. The marble remains "free floating" within the uterus, and has been shown to prevent estrus for up to 90 days, although longer may be possible (that was the duration of the experiment). I am unsure if any mare was bred after such a procedure, but there appears to be no reason why it should have a negative impact on fertility - it is less likely to cause problems than the long-term use of a progestagen to prevent estrus behaviour.
dear Jos thanks for your reply the question now is:how can I take out the marble?has it a piece of string remaining in vagina? something like human IUD? here we use a octopus-shaped marble insert in uterus for increase the milk production in cows. do you know some notice about?
Posted on Wednesday, February 19, 2003 - 11:29 pm:
This method is used on camels in the desert and really isn't anything new - but very interesting - wonder how many mares would do better with just a marble than a huge dose of hormones.
Removal involves a rectal palpation and the marbles is manipulated out - probably similar to the "pinching" off of a twin procedure.
Unlikely it will work in an ovariectomized mare, as it is thought that that it works by convincing the mare that she is pregnant and causes a retention of the CL. The CL is the structure on the ovary that secretes progesterone once she has ovulated, and prevents her from being receptive ("displaying") to a stallion. The trouble is, no ovaries, no CL!
I suspect you'll find the "hormone imbalance" in this mare is as a direct result of the ovariectomizing and the only way to correct it is to keep her on exogenous progestins! As a matter of convenience, you might want to investigate the injectable long-acting altrenogest that is made by BET Pharmacy which will maintain progestin levels for up to 30 days on a single injection.
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