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).
Chickens usually don't simply stop laying eggs when they get to a certain age, but they will lay fewer as they get older. That said, most laying breeds will lay more or less productively in backyard terms for five or seven years.We know of one ancient buff orpington cross who still lays an egg occasionally at 17 years old!!hat said, most laying breeds will lay more or less productively in backyard terms for five or seven years. We know of one ancient buff orpington cross who still lays an egg occasionally at 17 years old!!