I've seen a couple posts about this, and most seem to think it's either molt, or broodiness. A few of my hens have a lot of their breast feathers and some neck feathers missing. I was curious if it could be the feeder they feed from. I had a pvc pipe feeder, I assumed that the shape/height of that may be tearing up their breast when they peck at the feed. I built a new feeder box, much like many of them I see on BYC. Just a simple wooden box with a wooden tray at the bottom to hold the feed. They still have the same feather problem. They all are producing eggs. I tend to get one from every chicken daily. I'm mostly concerned because I don't want to continue into a Michigan winter and have them get frostbitten from missing feathers. I have Australorps and ISA Browns. I don't think it is broodiness. They tend to drop their eggs and run. There has never been feathers in their nest area. Does anyone have any advice? EDIT - BTW, this has been going on since early spring, it isn't a completely new thing.