Hi I had the same problem with mine for the longest time I couldn't get their feathers to completely grow back. It was nothing to do with them pecking one another, or not enough space. They have a big coop and outdoor space and diseases/pests was not the problem. I figured out that adding extra protein did the trick for my hens, like lentils, little bit of extra turkey meat, eggs,fish, flax, etc.. a few times a week and so on made a big difference. I know my hens don't get a lot of bugs out here in New Mexico, so I dig in my flower bed for juicy worms and other source of protein. They love it. Try adding the protein and see if that is what is missing. Good Luck!
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