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Cows are still fed grass. Over 90% of their diet even in grain-finished beef is grass. Chicken and pork I can't speak to as much.

In American feed lots? That's not what I read in the Omnivore's Dilemma. It was the opposite actually.

In feed lots they're fed grain, but that's only the last few months of their life. That's why it's called grain-finished rather than grain-fed.