I know the chickens are supposed to loose feathers when they moult BUT are we talking ALOT of feathers or just a few. I have 6 girls that started losing the back feathers and wing tips. They have been featherless on their backs for a few months now. I thought at first it was caused from the roos so I put saddles on them. The feathers didnt grow back and actually kept leaving. Now a few feathers are returning but tonight I tipped one upside down and found a bare bottom, clean as a babys butt! Not all of them have this. So my question is: Do I have something going on that needs to be treated? If so What? OR is this the moulting thing. They are poor layers now too. I introduced 6 new hens in july and all is well with them. They are this springs chicks. some of he original girls look skinny too. I have noticed maggot looking things in the poo tray when I change it but I think its because of the flys in the coop. I clean well once a week but by the end of the week it starts to get smelly. I have hung fly strips and they are loaded. Any thoughts for my issues would be appreciated!!