On average how many times does a mare come in to "Heat"?

Answer 1

In the winter months mares are usually anestrus, meaning they do not come into heat. While up to 25% of mares may actually show signs of heat and be willing to breed, most will not conceive.

With Spring comes increasing day length, the most important reproductive influence on the mare. This time is called the spring transitional period, and it usually occurs in March or early April. In the spring transitional period, follicles are starting to develop on the ovaries, but they do not reach maturity. This is a time of erratic displays of heat by the mare; Anything from coming in heat repeatedly only for a few days at a time, to staying in heat for two or more weeks solid can be seen.

When the first ovulation finally occurs, it ushers in the breeding season, and this usually happens in or around the first two weeks in April. Mares will often have regular estrous cycles, also called heat cycles, from now until sometime in August or September. An estrous cycle is defined as the period of time from one ovulation to the next, and it usually lasts 20-21 days. During each estrous cycle, a mare will be "in heat" for 5-7 days and "out of heat" for 14-15 days.

When a mare is "in heat", she is said to be in estrus, and she is receptive to the stallion. During the first part of this receptive period a follicle is enlarging on one of her ovaries. This enlarging follicle contains the developing ovum, or egg. The release of the egg is called ovulation, and this signals the end of estrus, which will occur in 1-2 days. Estrogen has been the predominant hormone during this time.

After ovulation, a structure forms on the ovary which is called the corpus luteum (or CL for short). The CL produces progesterone, which keeps the mare from coming back into estrus. This part of the heat cycle is called diestrus, and it is the phase that lasts 14-15 days. If a successful fertilization has occurred, progesterone continues to be produced, and the pregnancy is maintained. If no fertilization has occurred, the CL regresses at 14-15 days after ovulation, and estrus begins again.

After the summer and early fall have come and gone, and the breeding season with them, mares enter another transitional period appropriately called the fall transitional period. Most mares' cycles become erratic again, as they were in the spring. Ovarian activity is decreasing in preparation for winter anestrus

Answer 2

i own 2 mare and a genlding the mare come in heat ever 21 days.

Answer 3

Usually twice a year or more, when the weather is nicer like summer, spring or early fall. I know some mares going into heat in the winter too.

Answer 4

Usually it's around every spring/every fall.


Did you know a Mare's body knows to go into heat, by the amount of light that her eyes absorb? It triggers her body to produce hormones as they absorb a certian amount of light.

Answer 5

y'all need to check your horses!! Mares *should* come in once every 21 days unless bred. If they're only coming in twice a year there's something wrong. They'll cycle once a month unless bred.

Answer 6

ussually twice a year roughly seven days after foaling and then in mid fall. the foal heat is the best for catching. that is what we have done for years.