Hi everyone...I'm having a little trouble with my hens....they have bare butts and their feathers on top near their tail feather are gone. We thought they might of had mites (which I can see any) but we clean their coop and their run really good and powered the girls too. We did caught our white hens picking the other girls feather off and eating them. That problem has been taken care of ...but their feathers still doesn't seem to be growing back. I really need your help please. Dont know what to do.