This is similar to the pregnancy period of a woman, which is closer to around 9 months or ~260 days. However, actual gestation period of a cow can range from 270 days to 295 days, depending primarily on breed[s], age, body condition and nutritional health.Gestation period is also controlled by genetics, but not rate of maturity.his is similar to the pregnancy period of a woman,  which is closer to around 9 months o â¦ r ~260 days.    However, actual gestation period of a cow can range from 270 days  to 295 days, depending primarily on breed[s], age, body condition  and nutritional health.
Whereas fertilized chicken eggs usually take exactly 21 days to hatch, most duck eggs take 28 days, apart from Muscovy ducks. As a general rule of thumb, the eggs of Muscovy ducks take 35 days, but once again, it can vary slightly depending on conditions.
I am often asked how long it takes quail eggs to hatch. The incubation period for bobwhite quail eggs is 23-24 days. Here is a link to information on incubating bobwhite quail eggs http://www.farmingfriends.com/incubating-bobwhite-quail-eggs/.The incubation period for Coturnix (Japanese) quail eggs is 17 days.Here is a link for information about incubating japanese quail eggs.sually the hen will keep sitting if she thinks the other eggs are fertile and I have read that the hen can feel movement in the eggs so will keep sitting. Quail eggs take about 17 days to hatch and hen eggs take 21 days.