That is outside what I would consider attempting. I was thinking more of four to six birds in a 10 x 10 pen that would be allowed to free range every day and have access to compost and hay piles. Waste from butcher would be major protein source as well as fish offal. Scratch grains would be used for real.That shouldn’t be an excuse for keeping 100 chickens in an 8’x8’ horse stall and feeding them rotten fruits and vegetables. The owner has chicken feed available and she gave the birds some chicken feed, but the bulk of their diet was rotten fruits and vegetables, stale bread, and whatever garbage she had on hand.