Hi, My maiden mare is 10 years old. I bred her last month, but vet said at day 17 that she is not pregnant. I think we may have gotten her to the stud too late. She was not behaving in-heat at home. On Friday, June 21, I finally saw she was wet under tail and took her to neighbors gelding where she promptly squealed, striked, pee'd, spun hind quarters to gelding for mounting... . Within a few hours, we were at stud's barn, she was shaken from haul but she willingly permitted stud to mount shortly after arrival. She was left with stud in pasture and seen mounted several times that evening and again in morning. By afternoon, she was losing interest and we brought her home the following day, Sunday, June 23. Does her rapid loss of interest suggest that we were too late in getting her to the stud?
At ultrasound 17 days later, July 10, vet says not pregnant and that she cannot feel a follicle. three days later, I took her back to the stud. We are now at day 22 and still no sign of heat. Could she be pregnant and vet missed it? Could she be taking much longer to go back into heat than the standard or did we miss something? Could she have miscarried first causing late heat this time? Are early miscarriages in horses as common as in people?
In another post, I read that the follicle grows 5mm per day. Follicle is ready at 40mm which would take about 8 days. So, if vet ultrasound at day 17 and can't find a follicle, then does it stand to reason that the earliest she is likely to go into heat is tomorrow (8 days since ultrasound) and that puts us at 25 days (suggesting a cycle longer than that if we got her to stud orinally late in her heat) since she came home from the stallion. When should I expect her in heat? Not eager to ultrasound multiple times, would rather wait for her to indicate something, but how long to wait?
Finally, someone once described to me that the egg passes through a gray area on the way to the uterus and at this time, it cannot be seen in an ultrasound, does anyone know when this gray window would occur? Perhaps it was in gray area at time of ultrasound causing us to miss the pregnancy?
Thanks for your help, Stephanie
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