Those that can keep a healthy herd of Buffalo have several thousand acres for the large animals to roam and graze. Usually found in the plains states and there are a few smaller herds here in California and maybe others in other states. If memory serves me correctly, the largest herd is on Indian land in the Dakotas. The Buffalo is still considered wild, even when a fence surrounds them, so it is difficult to get a permit to raise them. Actually, you put them on the land and they take care of the rest. No growth hormones, no antibiotics, no mad cow. They eat grass and provide excellent nutrition, warm robes and even their skulls are considered valuable.