I have written before and thanks again for the info. I have purchased an older mare from a reputable farm in Ontario and the manager reaffirmed her breeding soundness to me. She has missed a few times in recent years and slipped her 2001 foal in Jan. Before breeding her back I had her ultrasounded and 5-6 cysts were found on her uterus. I realize that she is done and have called the farm back to let them know of her poor condition and my dissatisfaction. They claim however, that she will carry to term, yet my vet says 45 days max. Just a last ditch attempt at some advice from you regarding this situation. (ovaries are fine nice follicle etc.) She also had a foal in 2000. What can be done for her? Am I correct in saying that these cysts don't develop overnight?
Thanks Gavin Christie
Posted on Thursday, May 10, 2001 - 04:17 pm:
The presence of uterine cysts are often not a problem with establishment or maintenance of pregnancy. In fact some mares have so many that an ultrasound will show an almost "Swiss-cheese" effect in the endometrium.
What is significant is the location and size of the cysts. If they are large enough to prevent mobility of the conceptus during the first 16 days after ovulation, then the mare will probably return to estrus and consequently loose the pregnancy. If the cysts are close to the cervix, there may be a compromising of the cervical seal, which could cause pregnancy loss.
To reiterate though - the simple fact that cysts are present does not in itself indicate the mare will be unable to maintain a pregnancy. Size and location are the issue.
If it is determined that a cyst requires removal because of size or location, several methods have been used, with varying success, including laser, puncturing of the cyst with biopsy forceps, aspiration with a large bore needle, use of DMSO intra-uterine and several other techniques (these are the most common). But as I say - if the cysts are not large or placed in such a way as to interfere, you are probably going to be able to get the mare pregnant and have her maintain pregnancy with no problem. As the farm indicates that they have done this in 2000, they are probably quite right and you have little cause for concern. It is extremely unlikely that a cyst would cause a late term pregnancy loss (which I'm guessing a loss in January would have been), but other factors are more likely - was the placenta evaluated?
Hope this helps.
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