I often make references to grass-fed livestock. This would seem to be an obvious concept, a pasture full of cows is still something that my generation might remember from childhood, before livestock was banned from suburbia for being stinky and attracting flies. Mom and I used to buy our milk (and ice cream!) at the local dairy. You could watch the cows come in from the field and go into their spot in the barn. They would get their udders washed and the milker attached, and would stand munching hay while they were relieved of their burden. Then off they would go, back out to the pasture. These cows were clean and healthy. It was obvious when you looked at them. The farm was a transparent operation, and their handling practices were there for all the world to see.
And while this is assuredly a big step up from confined animal feeding operations (CAFOs), this is not quite what I mean by grass-fed.