Processing grapes for wine generates thousands of tons of waste in the form of grape pomace, which consists of leftover seeds, skins and stems. Dairy and livestock are responsible for more than half of the state's methane emissions, owed largely to cow burps. Methane and hydrogen emissions were reduced compared with the control group, suggesting that grape pomace reduced enteric emissions without affecting production. With grape pomace, they absolutely love it.”Next on the list is a trial with olive pomace and working to understand the mechanism that reduces emissions. “There's a lot of room to grow in this space and we're excited about this work.”The research was supported by the California Dairy Research Foundation.