Is there any relationship between a mares cervical relaxation and her receptivity. I was suprised when I went in to AI my mare at her third day of receptivity that her cervix was closed although relaxed but not as open as I expected. She is currently seven days out from when she started showing strong signs of interested in the stallion. She is still receptive to stallion. Does this mean she has a problem? Any help or comments would be appreciated.
The cervix relaxes as a result of estrogen influence. The estrogen is secreted from the developing follicle, and is also responsible for encouraging receptivity to the stallion in the absence of progesterone. So yes, there is a correlation between the two, but be aware that it is not an absolute (i.e. you may find mares that are receptive, but have a tight cervix).
Resistance to a stallion's advances comes about as a result of progesterone influence. Progesterone is secreted by the CL, which forms after ovulation, and levels typically become significant enough to cause resistance 24-48 hours after ovulation. Hence, your mare is probably following a perfectly normal pattern and you should have no cause for concern.
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