Typically during the breeding season a mare will have a 21 day estrous cycle which is the interval from one ovulation to the next. This length will vary between mares and time of year.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
Signs of Diestrus include: 1  Indifference or aggression toward the stallion. 2  Moving away from a stallion. 3  Tail switching. 4  Ears back. 5  Squealing or kicking and striking.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
The test is based on detecting elevated levels of equine chorionic gonadrotropin in the mare's serum between days 40 and 120 of gestation. The test is 95 percent accurate. In addition, transrectal ultrasound is often used to determine pregnancy, especially if the mare has a history of twins or double ovulation. In this case it is used between days 12 and 15 in order to effectively manage pregnancy reduction to a single foal.
http://equimed.com/health-centers/reproductive-care/articles/horse-gestation-timeline
Signs of Estrus in the Mare include: 1  General receptivity to the stallion. 2  Tail raising. 3  Frequent urination. 4  Winking of the vulva. 5  Assuming a breeding/squatting stance.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
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http://equimed.com/health-centers/reproductive-care/articles/horse-gestation-timeline
Equine gestation facts and figures. Equine gestation is the period from conception to birth. It averages 340 days, but may range from 320 to 370 days, with mares being known to deliver a healthy foal after 399 days. If a foal is born before 315 days, it is considered premature and if born prior to 300 days, it will usually be too young to survive.
http://equimed.com/health-centers/reproductive-care/articles/horse-gestation-timeline
During this time the mare's uterus is changing shape with the uterine horn becoming firm and tubular and the cervix becoming firm and contracted. The uterine wall becomes thinner at the site of the implanted embryo. During this time, the mare's appetite increases and she may exhibit some moodiness. As the mare enters the mid stage of her pregnancy many veterinarians recommend a second pregnancy test because nearly one-third of mares slip or lose their pregnancy during the early days without the owner's knowledge.
http://equimed.com/health-centers/reproductive-care/articles/horse-gestation-timeline
Mare signaling receptivity to a stallion. 1  A mare allows the stallion to approach when ready to breed. 2  Many breeders use a teaser stallion to determine if the mare is receptive to breeding. 3  A stallion tests the air for pheromones that indicate that the mare is ovulating.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
Ideally, breeding should occur close to the time of ovulation. Breeding more than a day or two before ovulation or more than a few hours after ovulation is usually not very successful. The rule of thumb is to breed mares on the third day of eustrus and every other day until they go out of estrus.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
The estrous cycle is divided into two periods, estrus and diestrus with estrus being the time when the mare is in heat, usually for 3 to 7 days. During diestrus, typically 14 to 18 days, the mare is unreceptive to a stallion. Ovulation occurs one to two days before the end of estrus.
http://equimed.com/health-centers/reproductive-care/articles/the-horse-breeding-season
horse time of ovulation
Typically during the breeding season a mare will have a 21 day estrous cycle which is the interval from one ovulation to the next.