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History of Egg Farming. Between 1955 and 1975 flock size in a typical egg factory rose from 20,000 to 80,000 birds per house as producers learned to stuff and stack the cages.The automation of feeding, collecting, and removing wastes forced thousands of family egg farms out of business.In 1967, 44 % of commercial layers were caged; by 1978, 90 % were caged. Today, 98 % of all egg production comes from caged birds in automated factory buildings..

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