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[–] 16 points 2 years ago (1 child)

The 1940-1950 era is the rough timeframe when the factory farming of poultry took off, especially once antibiotics started being widely used to group even more chickens together in those factory conditions. e.g. https://en.wikipedia.org/wiki/Antibiotic_use_in_the_United_States_poultry_farming_industry#History_of_federal_policy_on_antibiotic_use_in_livestock

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