IN the mid-1990s, most dairy producers heralded recombinant bovine somatotropin as one of the greatest innovations in milking. Biweekly injections could capably increase a cow's daily milk production more than 15%. With the 2000s came a shift in public opinion against milk from rBST-treated cows. In 2008, the effects of consumer opinion were felt when Walmart decided to stock milk only from cows not treated with rBST.
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