Never mind, those are broiler chickens.
50000
They aren't.
Ray Martin
30,000,000 chickens - 85% battery hens
A battery cage is a small cage in which a hen is kept to lay eggs.
About 300 a year
on average, about 69
Warren chicks are cross breeds favored in Great Britain and often used in Battery farms.Crossed between the Black Rock and Isa Brown hen these birds are egg factories in themselves. In battery farms hey are usually culled at 72 weeks as they burn out relatively quickly.
Many farms have a cage/hut with straw, which acts as a soft nesting site, where the chickens can lay their eggs.
No, it is NOT right to kill battery hens. Unless they're fately ill or for food :( Every single hen has the right to have a free life.
On average a battery hen will lay about 250 eggs during her lifetime. Battery hens are often culled at at between 16 to 18 months old and used for meat.
Battery Brooding by Milton Arndt reports on this housing method in 1931.The book is the earliest source to reference the method yet the origins are unknown.