Dairy cows (IMAGE) Penn State Caption Researchers say there is significant potential to reduce greenhouse gas emissions in dairy production by employing feed and nutrient management practices to suppress methane and nitrous oxide emissions. Credit Steve Williams, College of Agricultural Sciences/Penn State Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.