My barn cats never bother the chickens. As a matter of fact, when I see mouse evidence in coop, I put a cat in there for the night. Two of my best hunters were actually raised by a rooster. The rooster saw little yellow fluff balls and adopted them. He was a very good daddy too. He was mortally wounded when 2 dogs came in the yard and he fought to protect them. But, back to the subject at hand, we have never had trouble with cats.