I have several hens that are losing a lot of feather off their backs where the tail feather start. Not the tail feathers but on the back nearest the tail feathers. I think that the Roosters may be doing a lot of it or either then hens are picking out their own feathers. They are barred rocks and I am really getting concerned. I have three roosters and 24 pullets. Tomorrow I will have one rooster and 24 pullets. Any comments are really appreciated.