While a change in the urine condition from cloudy to clear typically indicates a change in the secretion levels of estrogen from the follicle, there are no absolutes and ultrasound is the only way you are going to know for sure. As this is a clients mare you should have the mare checked.
Well, as one might expect, the mare was out of heat by the time the veterinarian arrived. It was decided to wait until a pregnancy check to ultrasound her.
Question: How uncommon is it for a mare to continue to show heat symptoms several days after she has ovulated? If it occurs with any regularity, what is the longest number of days it might go - after ovulation?
The mare will not become resistant to the stallion's advances until her progesterone levels become elevated enough to cause that resistance. Progesterone is secreted by the Corpus Luteum (CL) which is the structure that forms in the area on the ovary evacuated by the ovulating follicle. Progesterone levels will typically become elevated enough to cause resistance by about 24-48 hours after ovulation, but in some mares may take longer.
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