My chickens have been free-ranged for years, but the coyotes and raccoons lately have been devastating to my flock, despite live traps. I have begun to keep them in the coop and run, 12 chickens (4 being bantams) in a 16x20 area. Since they are no longer free-ranging, I would like to make sure their diet is sufficient. I was previously giving them basic lay pellets and oyster shell as supplement to their free-range diets.What should I feed them now? I want them to be healthy, not merely fed enough to sustain them.