I just stumbled upon an old school remedy for a way to repel other chickens from pecking and or rough treatment. (I have 13 hens, 1yr old +) but one of the slightly older chickens is mounting three of the younger ones to the point they have raw patches on their shoulders. Unfortunately, they are all Red, so it's very hard to detect which one is bullying the others. I read that they used to use talcum powder,,since we can't get Talc anymore, DE maybe???