Hello, I have a small backyard flock of hens; 2 golden laced wyandotte hens and 2 barred plymouth rock hens--NO roosters. A few months ago the 2 wyandottes began losing feathers on their backs and bottoms. The barred rocks are not losing any feathers. All birds appear healthy and active. They are allowed to roam in the yard during the day and are locked in the coop at night. They are fed layer pellets and cracked corn, with occasional scratch as a treat. Recently, a have noticed a few feathers reappearing on one of the wyandottes, but none on the other. I cant seem to find any information on what could be the cause of this. If it was mites, wouldnt all the hens be affected? And if it was moulting, why havent the feathers grown back (its been over 3 months)? Any help would be greatly appreciated. I dont know what to do this... Thank you!