is all lamb meat sold in the U.S. from grass fed animals?

Answer 1

Lambs that are raised in a feedlot for consumption are typically not feed any grass. They are usually fed on a pelleted ration possibly with some hay.

Answer 2

No. Its just like beef. You need to look for ones that say organic or grass fed.

Answer 3

their diet consists of grasses,hay,and grain based feed.salt and mineral blocks are usually provided also.