Hi. I’ve never experienced this in my years of chicken tending. I have two jubilee orpingtons that have missing and broken feathers (see pics). Vents are clean and no visible mites or lice and they have never been on the ground as they are in our giant 8’ x 4’ brooder right now. I don’t think the others are bullying but it could be possible. They are on 18% protein and are feed black solder fly larvae daily. Any ideas? Thanks for reading.