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“Factory farming began in the 1920s soon after the discovery of vitamins A and D; when these vitamins are added to feed, animals no longer require exercise and sunlight for growth. This allowed large numbers of animals to be raised indoors year-round. The greatest problem that was faced in raising these animals indoors was the spread of disease, which was combated in the 1940s with the development of antibiotics. Farmers found they could increase productivity and reduce the operating costs...   >>>

“Factory farming began in the 1920s soon after the discovery of vitamins A and D; when these vitamins are added to feed, animals no longer require exercise and sunlight for growth. This allowed large numbers of animals to be raised indoors year-round. The greatest problem that was faced in raising these animals indoors was the spread of disease, which was combated in the 1940s with the development of antibiotics. Farmers found they could increase productivity and reduce the operating costs by using mechanization and assembly-line techniques.



Unfortunately, this trend of mass production has resulted in incredible pain and suffering for the animals. Animals today raised on factory farms have had their genes manipulated and pumped full of antibiotics, hormones and other chemicals to encourage high productivity. In the food industry, animals are not considered animals at all; they are food producing machines. They are confined to small cages with metal bars, ammonia-filled air and artificial lighting or no lighting at all. They are subjected to horrible mutilations: beak searing, tail docking, ear cutting and castration. Even the most minimum humane standards proposed are thwarted by the powerful food conglomerates.”



The above is an excerpt from Factory Farming Facts which can be found in this link http://www.idausa.org/facts/factoryfarmfacts.html



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