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Unlike most dairy cows in America, which are descended from just two bulls, this cow at Pennsylvania State University has a different ancestor: She is the daughter of a bull that lived decades ago, called University of Minnesota Cuthbert. The bull's frozen semen was preserved by the U.S. Agriculture Department. Dan Charles/NPR hide caption

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Dan Charles/NPR

Most U.S. Dairy Cows Are Descended From Just 2 Bulls. That's Not Good

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Holstein cows at Homestead Dairy in Plymouth, Ind. Mira Oberman/AFP/Getty Images hide caption

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Mira Oberman/AFP/Getty Images

Gigi The Cow Broke The Milk Production Record. Is That Bad For Cows?

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