I have several hens almost stripped naked by the roosters. I have separated them from the roosters and I would like to feed them with food that stimulates feathers regrowth. I know "high in protein" is the standard response and I am feeding them with a feed which has 17% protein, but can I add anything else to their diet? We do NOT have those ready mixes available in the USA for faster feather growth, and I don't know what is in them. Any link or suggestions would be appreciated. Their backs are naked from mating, no aggression, no wounds..