I have 5 hens all about 1-1/2 years old. I have 3 RIR, 1 buff orphington, and 1 cornish. A few months ago I noticed feathers missing on a few of them. The cornish being the worst of the bunch (missing a majority of her feathers). After researching online I found that a lack of protein might be the issue, so I increased their protein intake, however this does not seem to be working. It doesn't appear that there is just one culprit as all 5 are missing feathers. While monitoring them it appears they will peck at anyone randomly. It is starting to cool down at night here and winter will be here before we know it, so I need to get this issue under control so they have feathers to keep them warm. I'm not sure where I should go from here so I would appreciate any suggestions. If you have any other questions let me know! Thanks!