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At the risk of stirring the pot, how 'bout having never been on the ground in their whole life? Battery hens, i.e., hens raised for egg laying, are raised up in a grower house. The newer grower houses have the enviroment computer controlled - lights, air, feed, everything. Once they are at point-of-lay they are moved to the battery houses. They live in a small cage, surrounded by other caged hens, with their food in front of them and a place where the egg can drop out behind them. Around here the battery hens are slaughtered at 60 weeks (roughly 15 months) and replaced with new ones.
All things considered they still have a longer life than the broiler birds, who are raised in houses with 30,000 other chickens (in the newer houses), then caught and slaughtered in the 6 to 8 week range.