I've had chickens over a year now and I currently have 16-(with three being pullets). I've never raised meat chickens before so got several questions. 1) I have cornish rock mixes and white rocks coming, do I need to keep them separate? 2) Do I need to feed them special meat bird feed? 3) Do I provide grit if using the meat bird feed? 4) How long will it take before the cornish mixes are ready to be processed? 5) How long will it take the white rocks before they are? 6) Do I keep them separate from the aracauna chicks to keep their feed separate? Thanks!!!