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Pregnancy and follicle

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 1 » Pregnancy and follicle « Previous Next »


Author Message
 

Anonymous
Posted From: 216.183.141.10
Posted on Tuesday, July 13, 2004 - 02:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I had my mare ultrasounded on her 19th day from her last breeding.The vet saw a pregnancy plus a enlarged follicle.This mare also showed the same when she was ultrasounded with her last pregnancy 2years ago and produced a healthy foal.My question is what does this finding mean,a pregnancy and a follicle?
 

Jos
Posted From: 137.186.22.83
Posted on Tuesday, July 13, 2004 - 10:13 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

It means there's a pregnancy and a follicle :-)

Lots of people get concerned when they hear there is a follicle present in a pregnant mare, but it is not a cause for concern. Mares are capable of producing a follicle in the face of elevated pregesterone levels, and will do so when not pregnant too ( a mid-cycle follicle, which may even ovulate). When pregnant, it is in fact essential for successful pregnancy maintenance that they produce follicles (and more specifically CL's) after about 35 days.

I would relax - if there is a problem with pregnancy, it won't be connected with the presence of the follicle!
 

Sandra KS
Posted From: 68.73.212.12
Posted on Wednesday, July 14, 2004 - 05:36 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hmm, that's interesting. I've bred my mare twice AI this year, and both times the vet seemed to take the presence of a follicle as some evidence that the pregnancy did not take. The first one can't have, since we rebred and a check on that second 24th day was also negative (would have been about 44 days after the first try)...but I wonder if the vet could have missed a pregnancy that second time. She seemed pretty sure not though.
 

Jos
Posted From: 137.186.22.234
Posted on Wednesday, July 14, 2004 - 10:44 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If the mare is not pregnant, then yes, there is likely to be a preovulatory follicle present about 20 days after the previous ovulation. However, the presence of the follicle itself does not indicate that the mare is not pregnant for the reasons I give above.
 

Jan Schmidt
Posted From: 216.183.143.246
Posted on Thursday, July 15, 2004 - 10:14 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks Jos for your reply to my question.I was speaking to my vet yesterday in regards to a unrelated issue but did bring up the ultrasound finding and he added that he saw so many of the same on ultrasounds, a pregnancy and a follicle he wasn't concerned but suggested another ultrasound at 30 days.In your opinion do you feel that it is necessary and safe?
Jan

 

Jos
Posted From: 137.186.22.19
Posted on Thursday, July 15, 2004 - 09:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

We actually recommend ultrasounding at about 15 days, and then again at 28 days. The 15 day ultrasound is to try and catch twins and deal with one if necessary while the conceptus mobility stage is still going on ( <16 days). The 28 day ultrasound is very important to prevent missing twins. There is always a possibility of an asynchronous ovulation. This is where there is more than one ovulation, but the subsequent ones occur on a different day. There have been pregnancies recorded from ovulations happening as long as 6 days after breeding, so the possibility exists of a second follicle ovulating as much as 6 days after the first one resulting in a pregnancy. As one is doing the first pregnancy check at 15 days after [the first] ovulation, the second one would only be a day 9 pregnancy at that stage if the 6-day-later ovulation happens, which would not be detectable at that time. Checking again at 28 days though would result in the identification of a 28 and 22 day pregnancy, which should be easily observed. Checking only at 28 days would be counter-productive though, as there is a higher successful resolution of twins if the reduction is performed prior to fixation at 16 days.

As far as safety is concerned, there is no problem there. CSU did some research that showed that repeated palpation and ultrasound post-ovulation did not result in an increased level of pregnancy loss. Interestingly though, repeated palpation/ultrasound prior to ovulation did result in lower pregnancy rates.



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