In 2014, the U.S. national dairy herd produced twice as much milk as it did 90 years ago, but with about 60% fewer cows.
These productivity gains were achieved through continuous improvements in animal genetics, nutrition and management. As a result of developing "cleaner, greener" cows, animal scientists and dairy producers have reduced by half the enteric methane emissions per unit of milk produced in this country, according to Alexander Hristov, a professor of dairy nutrition in
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