Mendel was not the first to propose genetics however, he was the first to figure out that genes (he called them elements) came in pairs and that one member of each pair came from each parent. As a result of his realization regarding pairs of genes, Mendel determined what are called Mendel's laws of inheritance..
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.hickens usually don't simply stop laying eggs when they get to a certain age, but they will lay fewer as they get older.
Most producers like flocks to begin laying at around 20 weeks of age. A flock of hens will lay efficiently for 60-65 weeks. White egg birds will lay 260-285 eggs a year and eat 3 pounds of feed for every dozen eggs they produce. Brown egg layers will lay 240-280 eggs a year and eat 3.5 pounds of feed for every dozen eggs they lay. Once the hens lay for 60-65 weeks, they are rested or molted. This will force all the hens to stop laying at the same time and allow them rebuild calcium stores and restore body condition.