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STUD SERVICE: Farmers select cattle with genes linked to high milk production and other valuable attributes. They also weed out cows with problematic traits. +
SRDJAN ZIVULOVIC/REUTERS
IN 1962, the Arlinda farm in Northern California purchased a milk cow from Nebraska named Beauty. The manager bought the cow because she produced a lot of milk, but there was a big bonus: Beauty was pregnant. It would prove to be one of the most significant purchases in the history of the dairy industry.