The biggest greenhouse gas reduction was of enteric methane, which is the gas that cows belch throughout the digestive process.
California’s dairy industry has also reduced water usage by 88 per cent and uses less land, the release said.
“Dairy farmers are doing a lot to help reduce the industry's environmental footprint," Ermias Kebreab, a professor of animal science at UC Davis and senior author, said in the release.
The study is published in the April edition of the Journal of Dairy Science.
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