Previously 2 of our hens had bare backs from our rooster. We purchased some chicken coats and their feathers grew back nice and thick. They look great! Today as I was cleaning the coop I noticed a huge pile of feather in the corner of the coop under where they sleep. I inspected the hens close and noticed one of my black sex links was missing feathers under her tail. Any idea what this is? She had never looked ratty like this before and they are about a 1 1/2 years old. So they haven't molted yet. Could that be it? It worries me because it's getting cold and snowed a bit yesterday. Please help!