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Trends in Genetics Today, I want to take a historical look at how we’ve changed our cows and discuss why we were able to generate such change. The Council on Dairy Cattle Breeding does a terrific job tracking how cows have changed over time in the United States. The average milk yields of Holstein, Jersey and Brown Swiss cows are shown in our chart. In most instances, a cow will have a calf, milk for approximately 10 to 12 months, and then enter a non-lactating, or dry, period before the
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