I have some chickens that are just over a year old. When I ordered them I ordered Rhode Island Hens, I also have White Leghorns but they have not lost near as many feathers as my brown ones. , they are loosing feathers. some lost just a few and some lost most of them, and they are not growing back. They have been this way for a few months now, I am pretty sure it is not a molt (not old enough) but I suppose it could be. Are they lacking something, or do they have mites or something? I keep powder in there and they dust themselves often and I powder the roosts, and floor every so often. It almost seems like they start to grow but then within a day or so they are slicked clean again? are they eating them? what could they be lacking if anything. if anyone has any suggestions on what this could be please help me out.