I have 8 RIR hens that are a little over a year old. Four hens have bare butts! I assumed that they were moulting, but their butts have been bare for a few weeks now and I am getting concerned that I might have something else going on here. As I am new this year to raising chickens I would appreciate whatever you can tell me about these bare butts! One chicken has a very red butt!! If they are moulting, could it be that they need some extra nutrition or vitamins to grow new downy feathers? I feed them layer crumble, Cheerios, fresh fruit, and they free range in grass for bugs & such. Thanks, P & Q Ranch.