Uncaging laying hens and giving them more freedom seems like an obvious win for animal welfare. But when researchers counted not only behavioral benefits but also feed, emissions, land use, disease, and deaths, the humane choice became surprisingly complicated. The price of an egg, it turns out, includes trade-offs that never appear on the carton.
The average laying chicken has a life expectancy of about two years, far greater than that of its brethren, chickens bred for meat, who barely reach chicken “tweenhood” at six weeks, when they “move on.” So for the laying chicken, free-range is indeed more of a lifestyle than for the “broilers,” where, in the words of Michael Pollan, free-range is more of a vacation option than a lifestyle choice. That said, laying chickens begin producing eggs at about five months of age and continue to be egg factories for about a year, after which age results in fewer eggs with more fragile shells, and the layers “move on.”
Animal welfare proponents have emphasized the need for a free-range environment, especially compared with battery-cage life, the chicken version of tenements. Battery or unenriched cages are minimal, bare-wire enclosures designed to maximize operational efficiency—with continuous metal feeders, automated overhead watering, and a sloping floor that allows eggs to roll onto a conveyor without assistance. Unlike “furnished or enriched” cages, they have no nest boxes, perches, scratch pads, or litter areas. Battery cages are the studio apartments of layers, with square footage smaller than a single sheet of paper, restricting much natural movement.
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