I've got six BR hens and one rooster all housed in a 8 x 6 coop for the winter with access to a 8 x 8 fenced & covered run. They've wintered fairly well with one exception. Two of the hens have missing feathers on the back of their heads. Both are bald back there and one is pink but not bloody from pecking. My question is; is my rooster pulling out the feathers when he mounts the hens or is it the other hens being bullies? I watched them yesterday for 45 minutes or so and the rooster was not in any way aggressive but the other hens picked on the two with the feather damage. Are they feeling cooped up? I feed them laying mash from the local feed store, not scratch and they get lots of extra protein from kitchen scraps. I'm concerned someone is going to draw blood and things will get messy!