One of my hens started losing feathers on her neck and chest. At first I thought that she was getting pecked by the other chickens so I took action for that. However, I came to find out that she wasn't getting pecked. Her feathers never have grown back in and now several of the others are starting to lose their feathers on their necks as well. Also I noticed that she has diarrhea as well. Does anyone know what they might have? and a organic cure?