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Follicle size

Discuss tips and tricks used in live cover and AI situations.

Moderator: Jos

Follicle size

Postby thisby1 » Sat Jul 20, 2013 11:29 am

Hi
I have a mini mare who started showing signs of heat 4 days ago. I teased her with my stallion each day but he was just not interested. I had the vet out yesterday to scan hr and she had a 32mm follicle.

I was expecting to have to wait a few more days before she ovulated, but today my boy was very keen and covered her successfully.

My question is could the follicle have ripened overnight? Could she have ovulated?

I am grateful for any thoughts
thisby1
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Re: Follicle size

Postby Jos » Sun Jul 21, 2013 11:48 am

  • Follicles grow at a rate of 3-5 mm per day.
  • It is unusual for mares to ovulate on follicles smaller than 35 mm, however it does happen and there is a wide range of pre-ovulatory follicular diameter.
    • This may be even more so in the Miniature Horse.
  • Mares are typically in estrus for 5-7 days, although at this time of the year in the northern hemisphere, the estrus duration will tend toward the shorter duration.
  • Some mares display estrus only around the time of ovulation, even if being teased by a stallion.
    • Some display the entire duration or not at all.
  • Although some people claim that their stallions can indicate ovulation, external factors such as liking a particular mare, or having been teasing himself by looking at her over an extended period of time (for example - other factors can also apply) are more likely to influence stallion response.
Bottom line? The only way to tell for sure is to have the mare checked.

You might also have a better indication if you know what the appearance of the follicle was at the last ultrasound - see out article about predicting ovulation.
We're always happy to try and help, but don't forget to check the articles section
of the website too, which has a search engine to help you look for answers!
:)
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Jos
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