World War II: The first self-propelled grain combines were introduced. They enabled U.S. farmers to produce substantially more grain than the nation's population could consume.
Late 1950s: Poultry industry moved the chickens out of the pastures into huge buildings. It took only 7 weeks to raise a chicken compared to the previous 3 months.
1960’s: Dairy industry evolved away from the small 25-cow, pasture-based dairies to huge operations with 1,000 or more cows housed in feedlot conditions being fed grain and milk production per cow had soared as a result.
1970’s: Pork industry followed suit by moving sows indoors where they were fed grain and turned into living machines that mass produced more live pigs than ever before. Piglets weaned at 30 days and are fed more grain. They grow exceptionally fast to produce more pork
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