I was worried about my Barred Rock and Rhode Island until I met the neighbors chickens yesterday. Among many other birds he has ducks and goats. Both his BR and RIR are are losing feathers in the exact same place (lower back). I feel much better now. I was afraid to move the 6 week olds into the barn untill now. At least nobody is sick. Saving the rest of the Blu-Kote for an actual emergency now.