One of my hens, Rubooshka went through a moult a few months ago and fully grew back her feathers. Then some of my others started loosing feathers and I figured it was a normal moult but Blackberry, my Australorp has not had any feathers on her back or head since February and I don't think they are in a rush to come in. Most of my other hens don't have feathers on their heads and some don't have them on their backs but none are as bad as Blackberry is. Another reason I don't think this is a moult is because she lays eggs daily, I see her. We haven't noticed a decrease in eggs. In fact, sometimes we get nine eggs out of nine hens in a day. The roosters are perfectly normal. They don't seem to be losing feathers. Everyone is acting normal, eating and drinking. I don't know whats happening so I would really appreciate some help.