Thats what I figured, I dont have the space to free range them, this does scare me. We have a neighbors cat who thinks he owns the place and we raise English springers so our rear is taken over by them.
Deep litter and feeding FF will go a long way towards decreasing the stink and mess of meaties. Just keep layering in the litter over the poop and it will keep down the smell and the flies. Also helps if you give them a lot of fresh air, a place for sun and exercise...you can do that by putting feeder on one end of the pen and the water on the other. You can also build them roosting off the floor to keep them cooler at night and also cleaner. They need nice, wide roosts....much wider than other birds...10-12 in. wide.