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).
Older chickens lay bigger eggs. Although egg size varies between breeds, as a chicken ages her eggs will increase in size. Most breeds become less productive after 2 years, but will continue to lay for 5 or 6 years.