I have 7 hens and 1 roo. 4 of the hens were raised with the roo, and they are about 1.5 years old. The roo is not aggressive towards people at all, but the oldest hens are missing quite a few feathers on their back. My concern is that winter is soon coming, and their bare back will get cold. Should the roo be separated to let them regrow their feathers, or will separating him cause more problems?