Study examines environmental footprint of California dairy cows over 50 years

Dairy cows photographed at the UC Davis Dairy Barn in 2019. Credit history: Karin Higgins/UC Davis

Manufacturing a liter of milk in California emits considerably less greenhouse fuel and employs significantly less land and h2o than it did in 1964, according to a latest study from scientists at the University of California, Davis.

“We when compared 1964 through 2014 and found a 50 per cent reduction in greenhouse gases to deliver the same amount and excellent of milk,” claimed senior author Ermias Kebreab, professor and Sesnon Endowed Chair in the Department of Animal Science at UC Davis. “The magnitude of change is stunning.”

Scientists carried out a lifecycle environmental evaluation of cows from the time they are born to the time they leave the farm gate. The review involved such inputs as generating feed for the animals, and the machinery and transportation required to make milk.

Cows belch methane, a powerful greenhouse gas, as section of their digestive system. The study observed the major emission cuts arrived from reductions in these emissions, known as enteric methane, compared to reductions in emissions from manure.

“Reductions in enteric methane depth (i.e., methane emissions for every gallon of milk) are principally a outcome of better genetics and breeding and improved diet for the animals,” mentioned Kebreab.

Water and land use

In addition, drinking water use in the field has dropped by 88 p.c, because of largely to productive h2o use in feed crops and the use of crop byproducts for feed these kinds of as almond hulls. Drinking water use in housing and milking also dropped by 55 %.

The sum of land it normally takes to generate a liter of milk when compared to 1964 has also diminished. This is largely because of to advancements in crop genetics and manufacturing techniques that have increased yields of grain, hay and silage for cows on the very same amount of money of land.

“We have saved an quantity of land equivalent to the measurement of Connecticut,” reported Kebreab.

About the very last 50 yrs, dairy manufacturing in California has gone through considerable enhancements and breakthroughs in animal husbandry, feeding and housing tactics, and in animal and plant genetics and crop creation methods.

Whole greenhouse gas emissions from cows over-all has enhanced in California as more cows are needed to feed a developing population. But cows are now making considerably much more milk. In the 1960s, one cow could deliver about 4,850 kilograms of milk per calendar year. Now a cow can deliver much more than 10,000 kg yearly.

“There is a ton of dialogue about how cows have a massive environmental footprint, but no just one is talking about how the dairy business has modified,” reported Kebreab. “Dairy farmers are executing a good deal to assist reduce the industry’s environmental footprint.”

Researchers continue to glimpse for methods to cut down enteric methane emissions by superior animal nourishment, which include feed additives. In a earlier study, Kebreab found that feeding dairy cows a little total of a seaweed termed Asparagopsis armata alongside with their feed, decreased methane emissions by up to 60 percent.

California is the best dairy making point out, and milk output is the third largest agricultural industry in the United States.



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