I am a first time chicken owner. I "inhereted" these girls last March and have them in a tractor. The problem is that around August one of them decided to stop laying, then the other three followed. Have not had any eggs since October. One of them started to lose feathers around the same time, and they other three tooks their turns one by one. I did some research and the food is fine and they have none of the issues that are related to feather loss. By the way, I live in NM so the winters are not bad at all. So my question happens to be, is this normal? or am I over reacting? Thanx for any input.