I followed my mares follicles and she had a dominant follicle which grew to 51mm yesterday afternoon and then recessed slightly with ovulating somewhere between 7:30 PM and 1AM. I bred her at 1:30AM and while her cervix was open, it was not as 'loose' as I would have expected and for the last day prior to breeding, she was not teasing and acting as if she were in heat any longer. Is this possible that she would be going out of heat prior to actually ovulating - and does this have any effect on the potential for fertilization?
A handful of mares will cease estrus display before ovulation. As long as the mare did not ovulate a second (first?) follicle prior to the one you identified, the chances of pregancy establishment should be fine. Even if you did breed on a second ovulation, they still should be good as long as the cervix was not closed too much becuase of an increase in progesterone secretion from the first CL. If the cervix was closed enough that fluid could not be cleared from the uterus, you may have a problem.
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