I have 4 chickens all different breeds but they are all reaching about 1 yr old. Our Delaware has not produced an egg for several days now and the back end is bare. I read that when they molt egg laying will stop, but is it normal to molt before a year old? And do they usually start at the back end? When daylight hours were shortening we did add a light to the coop to continue production and the others have continued to lay. Should I be concerned or assume it is molting? Suggestions please.