Posted on Saturday, September 30, 2000 - 05:14 pm:
I want to breed my 4 year old mare but 3 vets say she has juvenile ovaries and will not produce eggs. Is there any hope for her?
Posted on Wednesday, October 04, 2000 - 05:30 am:
Some 3 year-olds just aren't quite mature enough to be bred - I've seen them have very small ovaries at three, and not show regular estrous cycles, but then when they come back as a four year-old, they have matured, and everything is working just fine.
So yes, there is hope for her!
In the event that she is apparently the same next year, you might want to have her "karotyped", which is checking her chromosome make-up. There are a very small percentage of animals that get mixed up in sex-determination shortly after conception, and they end up with one too many or too few chromosomes, and are infertile. This is a very small percentage though, and the ovaries would be extremely small - pea size.
Posted on Friday, October 06, 2000 - 05:46 pm:
Thank you very much for the info!
Posted on Monday, April 08, 2002 - 10:03 am:
How great is the possiblity that a 20 month old Filly could get Pregnant? I am not trying to breed a young filly but I am afraid it may have happen by accident(Stallion got out of stall and over fence with two yearling fillies when no one was home. This happened last year and my vet felt it was very unlikely they got pregnant so I went into denial. Both fillies were showing signs of heat at the time they were exposed. Now after having forgotten the whole episode I am worried again because both fillies appear to be growing bellies. If the worse case is true how bad is this for the fillies future health and development?
Posted on Monday, April 08, 2002 - 10:13 pm:
It is very likely that these fillies are pregnant if they were exposed to a stallion at a time when they were in estrus and close to ovulation. Fillies are sexually mature at any time from about 10 months onwards.
While it is not desirable, there may be no repercussions from these fillies having foals, or there may be growth stunting and the possibility of foal rejection. There is no hard-and-fast rule in these matters.
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