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 are bred as broilers or layers. Broilers are bred to have large amounts of succulent, white meat, America's preferred cut, and slaughtered at between five and 14 weeks, depending on the breed. Hens raised to lay begin producing eggs from about four months into life. Chickens can produce an egg in roughly 25 hours and, with pauses every few days, lay over 250 per year. But productive layers slow down as they age. Towards the end of her second year, a hen's pace of egg production noticeably declines, and then ebbs until her eventual end.