The standard mare gestation length is from 320 to 362 days after the date of breeding, and on average, most mares will foal, or give birth, 330 to 345 days after a successful breeding. However, it is common for a mare to successfully give birth in a later period than the average range.Know More
Mares have their own individual gestation length tendencies. A pony will likely have a shorter gestation period than a full-size horse, but there can be exceptions. As a rule of thumb, ponies should be watched closely around day 300, as they commonly foal after 320 days. Gestation periods are also different in other equids, like donkeys, which gestate for 360 to 375 days. On average, donkeys gestate for 368 days. Goats gestate on average for 140 days.
Research has also tested the average gestation period range to see if certain variations can exist based upon various factors. For example, gestation periods of standardbred horses have been found to be longer when they occur earlier in the breeding season and much shorter when they occur more toward the end. Standardbred mares tend to have gestation periods of around 347 days, and these periods can fluctuate based upon the aforementioned factors.Learn More
The gestation period for dogs is about 63 days. This time frame is measured from the day of ovulation to the day that the dog gives birth. As with humans, the gestation period is divided into three trimesters.Full Answer >
According to the U.S. Environmental Protection Agency, the average gestation period for cows is nine months. Pregnancy in cows lasts 280 days, on average; however, cows can give birth up to 290 days after conception, according to Merck Animal Health.Full Answer >
The gestation period for a sheep is between 145 and 155 days. After that, the ewe gives birth to a lamb that can weigh up to 8 pounds. Shortly after birth, lambs are strong enough to begin grazing with the flock.Full Answer >
Although the time varies with the type of duck, the eggs of most common ducks hatch in 28 days. Commercial egg farmers typically keep eggs in incubators for 25 days. Eggs are often in hatchers for the final three days.Full Answer >