I am having a problem with some of my chickens. They are kept in the coup and yard most of the time. They have fresh water and feed everyday. I collect eggs sometimes twice a day. I have not noticed any runny stools, food, or watering changes. The coup has a heat light on that is on most of the time. The problem with the birds is.......some of the birds have lost a lot of the feathers around their bums and bellies. (not sure of the correct terms) Some of the birds have simply lost feathers and some have some open wounds on both belly and right at the base of their tale feathers. They are pitiful and I really want to fix them up, but I don't have a clue where to start! ! ! Any help will be much appreciated! ! !