Maybe cows are better grazing on seaweed rather than only grass. This study from UC Davis shows that including seaweed in cow diets reduces methane form the cattle.

Researchers at the University of California, Davis have found a surprising food source that could help reduce cows’ methane production: seaweed. A recent study from the university suggests bovines who eat an experimental mix of special food and a specific strain of seaweed produce less greenhouse gas than their peers. According to Pennsylvania State University , agriculture contributes up to seven percent of America’s greenhouse gas emissions. Each day, ruminal animals (like cows) belch up to 264 gallons of carbon dioxide and methane. As much as 20 percent of agricultural methane emissions comes from animal burps alone. To reduce those emissions, UC Davis researchers experimented with new feed combinations for cows. The cows’ hay is mixed with up to one percent of a naturally occurring red algae , Asparagopsis armata. To encourage the cows to eat the new food, molasses is added as a natural sweetener and to mask the salty taste and smell. To measure effectiveness, researchers take the livestock to a special “breathalyzer” chamber three times daily, where cows’ breath is measured for gas content in exchange for a cookie. The cows who ate the seaweed-mixed feed saw a significant reduction in methane production . Across three […]


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