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.
Most breeds require about 28 days of incubation. The similarities in hatching duck eggs to other eggs are that you need the same temperature (about 99.5 degrees F), the duck eggs need to be turned and you'll need a safe environment for them. A duck incubator can be the same incubator you use for other eggs.So if you already hatch chicken eggs and you want to try hatching duck eggs, you'll likely already have everything you need.he Hova-Bator and Little Giant incubators work great for incubating all breeds of duck. The Hova-Bator and Little Giant with universal/chicken egg racks accommodate duck eggs nicely. Each turner can hold up to 41 duck eggs. All of our combo kits also work great with duck eggs.