All my birds are beautiful, but today I noticed my biggest hen missing features on her neck and her long tail features. No sores, redness etc. Just missing feathers. Looked for mites lice etc, nope nothing .we have no roo so not sure why this happened. We give them Layena crumbles And I give them other protein sources, boss, scrambled eggs etc. Is this a molt? She is 10 months old, and in real good health, eats like a pig lol. there are five girls, in a 5x 6 coop, 10x10 large pen and they free range the yard when the snow is not to deep ( like today) no healTh issues I know of, but again you are all the experts I come to when I need help. Any idea's ? Nope they do not peck each other, nor do they eat feathers either. I'm puzzled