Like all beef, grass-fed / finished beef is an excellent source of high-quality protein, iron, zinc, selenium, phosphorous, and the B-complex vitamins. But it is superior to grain-fed beef in a number of key ways. It is lower in fat and calories and higher in omega-3 fatty acids and CLA. The differences alone justify a switch to pasture-raised beef.
Fresh pasture offers hundreds of times more of these nutrients than a standard feedlot diet. As a result, grass-fed meat has up to four times more beta-carotene than conventional feedlot meat. Given all these benefits, a steak from a cow raised on pasture is even healthier for you than a chicken breast – the meat that health authorities are so quick to recommend. The steak has about the same amount of total fat, making it an equally good choice for a heart-healthy diet, but it has more omega-3s. What's more it has less cholesterol than chicken and more than four times more CLA. Move over chicken. Make room for grass-fed beef!*
*Excerpts from the book: Pasture Perfect: The Far-Reaching Benefits of Choosing Meat, Eggs, and Dairy Products from Grass-Fed Animals by Jo Robinson