I have a pen with 7 hens, all 1 year old. They keep eating each other feathers. Most of them are half bald. I had to remove one hen and put her in a different area because they created a sore on her back and they kept picking at it. I have had one die from a similar injury that i didn't catch in time. Now they are looking worse for wear. Some are loosing their neck feathers and loosing weight. I'm new to this whole raising chicken thing. Am I not feeding them enough? Are they needing a supplement? I have received different opinions about this. I need all the help I can get. I enjoy raising them but not having much luck. Any advice is greatly appreciated.