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

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

NPR - Dan Charles

Chad Dechow, a geneticist at Pennsylvania State University who studies dairy cows, is explaining how all of America's cows ended up so similar to each other. He brings up a website on his computer. "This is the company Select Sires," he says. It's one of just a few companies in the United States …

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