I have several hens, all with some sort of feather loss. I have a roo and nearly all hens have bare backs (and some at the base of their wings) from him I'm assuming. For a while now a couple hens have looked pretty ragged (broken off feather) all across their backs. Several are also missing feathers from their necks and chests. I thought maybe moulting at first but its been a couple months now so I'm thinking it must be something else. I was worried about lice or mites so cleaned and dusted entire coop with diatom powder. Any ideas? Maybe a combination of things. They all have varying amount of loss so I'm stumped. The best is only missing a few on her back. The worst, really ragged, missing all feathers on neck, back, chest and some on head.