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During this period, the mare undergoes a series of cycles, each approximately 22 days in length. The estrous cycle is divided into two physiological parts: estrus and diestrus. The estrus, or "heat" segment of the cycle, is three to seven days in length and is the time when a mare is receptive to the stallion.
Mature stallions can breed two or three mares a day throughout a long breeding season and maintain a good level of fertility, but young stallions should not be expected to handle this level of work.
Stallions can be safely housed together if introduced gradually and thoughtfully, ing to Swiss research.
Stallions may always be “on,” but that doesn't mean they can constantly breed. After all, they do need time to eat, sleep, exercise, and socialize. What is this? A stallion can typically cover one to three mares a day and about 30 to 40 mares in one year.
Stallions will typically remain fertile beyond their 20th year of age. The age that stallions stop producing spermatozoa will vary between stallions. It is important that semen is routinely evaluated on all stallions, especially when using older stallions because of the expected decrease of semen production with age.
A stallion used for breeding is known as a stud.
Close breeding such as a mating between sire and daughter will test the good and the bad genes in that family. Such matings are used on an experimental basis to discover if there are any undesirable recessives in the family (such as red coat colour in Friesians).
Most veterinarians agree the ideal time to castrate is between 6-12 months of age, but one must first ensure two testicles are present. Presence of only one testicle in the scrotum could indicate a condition known as cryptorchidism.
Most yearlings and two-year-olds can and will breed under good circumstances. There's probably not a horse practice without a firsthand story of the pregnant filly that was only with a colt until a year of age. So for sure, many fairly young colts can be fertile.
On average, however, males become fertile after six months of age and reach full sexual maturity by 12 to 15 months.