Feed, like I acknowledged in my original comment.

> ...corn and soy subsidies that in turn make cheaper feed...

Most of it doesn't go to any single use. Only 36% of US corn production goes to livestock feed. 40% to ethanol production. And while people like to complain about the caloric inefficiency of animals vs plants, the reality is that chicken being fed corn produces 5 million calories per acre, the same calories per acre as wheat. Almost all plant crops produce fewer calories per acre than that. For some reason nobody seems to be demanding that we stop eating wheat, nevermind things like lettuce, spinach, broccoli, onions, tomatoes, etc, that produce far fewer calories per acre.