Some of our hens that are in with a rooster have bare spots on their shoulders between the wings. I'm not sure if it's caused by the rooster grabbing or if the higher hens are pecking at them. How do you tell the difference? There aren't many bare spots above the tails. The bare areas have gotten larger--like 3-4 inches across--in the past month of winter weather when they are indoors more than out. Any thoughts? I've been putting on BlueKote and now have some very purple hens. Thinking about making some denim aprons for the poor girls.