My hens have been loosing their features for months. I don't remember what kind they are. Four are red, and one is black and white speckled. They weigh about 7-8 pounds and are 1 year old. They still lay almost an egg a day. They stared loosing their features in December or January. I have used diatomaceous earth several times in the coop and on the chickens. I have been putting Cider vinegar and garlic in the water in case it was mites. Feather loss is mainly on their backs, however it has started on their crop area also. Any help would be greatly appreciated.