A few years ago, a geneticist and his colleagues at Penn State made a shocking discovery: Most dairy cows in America are descended from just two bulls. "We've lost genetic variation," he said.
Cows in the U.S. #dairy industry are almost all descended from just two bulls.
No, you need way fewer than that to get a good handle on your breeding value. But they say a an entire coop-dom may not be such a great idea...