I am concerned about their feet. My brooder is 5 levels and has a wire bottom. The wire forms about 1/2 inch square pattern. It seems pretty rough to me. When I put them in the brooder yesterday I put them all on burlap. I laid the burlap over the wire, but now the burlap is all poo pooed on. I don't want them walking around in poop right? WIll that hurt them? I don't have any more burlap, I could take it our and wash it or is it ok for them to be on wire.