Butler county, way down. been declining for the last 5 years.No chicken litter used except in our deer carcass composter. Could a new commercial chicken operation across the road have any effect? Could our turkeys be getting diseases or parasites from the chickens over there? I would think it would have to be airborn? Could rats, coons, possums, birds be bringing something from over there to our side of the road? Wish I knew the answer!