Cattle Feed Additives Lower Greenhouse Gas Emissions Monday Apr 5th, 2021 News Reporter With California Ag Today, I’m Tim Hammerich. Cattle are sometimes criticized for their contribution to greenhouse gas emissions, but a new seaweed-based feed additive could make a big difference. Ermias Kebreab, associate dean and professor of animal science at UC Davis, says their research is showing big drops in greenhouse gas emissions with certain feed additives. Kebreab… “I have not seen any other additive that would reduce by as much as the seaweed that we had been working on. In this case, we've seen a reduction, anywhere between 50% to 80% or more. And it just depends on the substrate or what they have been fed. Those animals fed at the early stage with high forage high fiber, the reduction was more about 50% to 60%. And then when we go to more concentrate based typical feedlot diets, then we see the reduction of over 80%.”