The grain builds up the cow's fat reserves, creating the marbling that cooks love much faster than a purely grass-based diet. Because grass-fed cows never eat grain, they always have less fat.

“It’s really important to that eating satisfaction that we get from a steak or a roast.” With no nutritional difference between grass and grain finished beef, Mafi says the science also ...

and she said there’s data that indicates calves can eat the same poorer quality rations and distillers grains as cows, but they tend to do better when they’re still getting milk.