The calf was a normal 84-pound heifer and the 278-day breeding date was used. One cow was observed to accept service during 2 out of 3 pregnancies included in this study. In the calculation of results, all abortions were excluded, as well as one gestation period of 322 days from the last-known service.he calf was a normal 84-pound heifer and the 278-day breeding date was used. One cow was observed to accept service during 2 out of 3 pregnancies included in this study. In the calculation of results, all abortions were excluded, as well as one gestation period of 322 days from the last-known service.
This is another varies with the individual bird and the breed answer. Some chickens lay an egg almost every day, others every 1.5 to 2 days. Younger hens (called pullets if less than one year old) will lay smaller eggs at larger intervals until they reach maturity.ens lay eggs on the same schedule as without a rooster present. If the rooster is allowed to mingle with the hens, there is a high likelihood that the eggs will be fertilized. This could result in chicks if the eggs are allowed to incubate (either in the nest under the hen or in an egg incubator).
1 Itâs even longer when these chickens are exposed to a natural environment and without any aid of any artificial pellets to let them lay an egg earlier.  So in the overall average, chickens will start laying eggs between 5 and 8 months depending on the breed. Their eggs at first might be very small but after that it will be normal like all of the chicken eggs you can see in the market.