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A mare may be in heat for 4 to 10 days, followed by approximately 14 days in diestrus. Thus, a cycle may be short, totaling approximately 3 weeks. [21] Horses mate in spring and summer; autumn is a transition time, and anestrus occurs during winter.
The estrous cycle, also known as "season" or "heat" of a mare occurs roughly every 19–22 days and occurs from early spring into autumn. As the days shorten, most mares enter an anestrus period during the winter and thus do not cycle in this period.
A mare also does not have to travel to the stallion, so the process is less stressful on her, and if she already has a foal, the foal does not have to travel. AI allows more mares to be bred from one stallion, as the ejaculate may be split between mares. AI reduces the chance of spreading sexually transmitted diseases between mare and stallion.
Foals are usually born in the spring. The estrous cycle of a mare occurs roughly every 19–22 days and occurs from early spring into autumn. Most mares enter an anestrus period during the winter and thus do not cycle in this period. [54] Foals are generally weaned from their mothers between four and six months of age. [55]
By breeding mares only at the peak of their estrous cycle, a few thoroughbred stallions have mated with over 200 mares per year. With use of artificial insemination , one stallion could potentially sire thousands of offspring annually, though in practice, economic considerations usually limit the number of foals produced.
This period of advertised fertility is known as oestrus, "estrus" or heat. [9] In species that experience estrus, females are generally only receptive to copulation while they are in heat [9] (dolphins are an exception). [10] In the estrous cycles of most placentals, if no fertilization
Typically, heat begins in spring and lasts through fall; in climates with longer days, heat could reoccur year-round. Heat in cats lasts anywhere from two days to three weeks, but six to eight ...
In a harem model, the mares may "cycle" or achieve estrus more readily. Proponents of natural management also assert that mares are more likely to become pregnant in a natural herd setting. Some stallion managers keep a stallion with a mare herd year-round, others will only turn a stallion out with mares during the breeding season. [10]