I have Naked Neck hens with dry, peeling skin on their necks and crops. I have tried different creams, vitamin E, vaseline and aloe vera gel with no results. I feed them good quality layer feed, black oil sunflower seeds, vegetables, greens, cabbage, and some mealworms for a treat. Their coop and run are covered so very little sun is coming in. Does anyone have any suggestions as to what I can put on their necks or add to their food to help with this problem? Thanks