According to the non-profit In Defense of Animals, factory farming began in the 1920s. When farmers realized that their animals could still grow indoors when given Vitamin A and D supplements, they let go of allowing them adequate sunlight and exercise. Jonathan Safran Foer, author of Eating Animals, writes that the first factory farm arose in 1923, when Celia Steele found a way to keep her chickens alive through the winter by keeping them indoors and giving them vitamins. Once antibiotics were developed, there was a mass adoption of factory farming.
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