In fact, each pound of grass-fed beef produces 500 percent more greenhouse gases than grain-fed. What they don't say is that grain-fed cattle eat mainly corn. Meat cannot be marketed as organic unless it’s certified by the USDA Agricultural Marketing Service. Anyway both my land and the public lands that my animals graze upon are not suitable for farming. Other studies have made the same comparison between beef from grass versus grain-fed animals and found that the higher methane emissions from grass-fed cows … Even though my cows are purely fed grass and legumes and know first hand how important to the bottom line to have cheep grass at hand for my herd, I personally prefer grain finished. The grass, hay, or silage that is fed with the grain is simply acting as roughage (fiber) to slow the grain down long enough in the cow’s digestive tract so the microbes have time to extract the nutrients from the grain before the grain leaves the other end of the cow. Growing corn produces CO 2 and Nitrous Oxide (N 2 O), from chemical fertilizer; N 2 O has 15 times the global warming potential (GWP) of Methane. This is a special label you need to look out for. 10 Factors You Need to Consider When Choose Grass Fed vs Grain Fed Beef Organic cows are much healthier, but it’s possible for a cow to be grass-fed and not organic or vice versa. Grain digestion is an evolutionary back-up plan The reason grass-fed cows produce more methane is lignin, a …