NH TOP LINE: Milk production efficiency can reduce methane

Boosting milk production efficiency can reduce cow methane-emission intensity. ALSO: Dairy calf behavior and rabies in cattle.

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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