I have a 7 month old leghorn hen who is starting to loose just the veins of her neck feathers (quills and shaft are intact). I have a flock of 7 she is one of the two smaller birds, but none of the others are exhibiting this problem. Because of the weather all the birds are a bit stressed (no frostbite or other health problems), because they get limited sun and cold nights. This bird does not seem to be in pain or showing other signs of bad health and the skin at the base of the affected feathers looks healthy and there is no sing of actual plucked feathers or bleeding. Could this be a result of pecking by the other birds, and if so what can I do?