From Wikipedia, the free encyclopedia. Mamma mia [Ëmamma ËmiËa] (an Italian interjection, literally my mother) may refer to:  1 Mamma Mia (song), a 1975 ABBA song.  Mamma Mia!, a musical based on ABBA songs, which premiered in London in 1999.
The productive life of a layer hen is about 2 years. Hen usually start laying at about 5 to 7 months old and reach peak egg production at 11 months old. The number of eggs laid will drop at about 18 to 24 months old but some birds will continue to lay up to a year after that. Egg production will also drop when the hen molts or if nutritional needs are not met.
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.