I've got 5 laying hens. They are young and were doing just fine, and then in January, someone gave us a rooster. He was fine for a while, and then slowly starting loosing or picking his feathers out. After a month or so, he was totally bald. The others followed, and now they are all bald and have been so for at least 3-4 months. I've tried everything I can think of, thinking mites, lice, internal parasites, etc. I've used wood ash/diatomaceous earth for dust baths, spray their coop for parasites, dusted and sprayed them, give them vitamins/wormer in their water, increased their feed to higher protein, etc. But nothing helps! They are still bald and continue to pick their feathers. And when I say bald, I am not talking about patches of badness. I am talking totally bald, just a few feathers on tail and wings. Any ideas? They are still laying eggs and otherwise seem very healthy and active, but just without feathers.