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I've also got a feather-loss problem and would appreciate your views. This is my Australorp, Liquorice. Some background facts: she free-ranges with two other hens, no rooster, layer pellets as free choice, about three years old. And now her entire under-carriage is bare! She's been broody before and raised chicks, so I have seen breast plucking with her, but never like this! She's completely bare and what feathers are left are just a centimeter of quill, in a very distinct pattern (as you'll see in the photo). She's been like this for a few months now.
I've read it could be molting. It's the end of winter here so it is molt time: one of the others molted through winter (our winters don't get that cold) and the other is busy, but I don't think this is a molt ... there's no sign of pin feathers.
Self-plucking: possible, though I never see her do it or find black feathers. If it was, why would she be doing this?
Depluming mite: I though it might be this, but the vet did a skin swab and found no trace of mite. Also, I doubt mites would deplume in such a geometric way, with no loss on other parts of the body.
Protein deficiency: I'm giving her hard boiled egg now to see if this could be it.
What are your thoughts? Have you see feather loss like this before?