Physiological Differences between Grass and Grain Fed Beef

 The introduction part should include an brief introduction of grass-fed vs grain-fed beef. How the two diets affect the methane gas emission for the cattle. The different carcass compositions of these two diets such as the fat composition (Kidney, pelvic, heart), carcass weight, ribeye surface area and fat thickness. Also, talk about how yield grade the beef from the USDA. Please include citations.