[dmbche]

For anyone reading this, for having seen and chatted with a farmer raising AAA Angus beef for McDonalds, everything the above commenter is saying is wrong.

The beef are in lots as soon as they are taken from their mothers and are fed from soy and other crops.

Most of the beef production is not fed grass - or it is a byproduct of giving them access to outside, but isn't their main nutrition.