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Although the mare continues to ovulate regularly every 21 days throughout the breeding season, the length of estrus (sexual receptivity) varies from 2–8 days, and the length of diestrus varies ingly to maintain a 21-day interval.
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).
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 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.
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.
Stallions can be safely housed together if introduced gradually and thoughtfully, ing to Swiss research.
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.
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.
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).
If a colt appears to be breeding, does that mean he is mature enough to impregnate the mare? A. 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.