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The black-and-white cow on the milk carton, the billboard, and the children’s picture books is almost always a Holstein-Friesian, and that is not a quirk of illustration. One of the main reasons why Holstein cows are popular is that they produce more milk than any other dairy breed in the United States dairy industry. Roughly 9 in 10 dairy cows in the United States descend from Holstein stock, and the breed is found in more...