I have four hens, the oldest two are about 18 months old and are missing a few spots of feathers on their backs but my two youngest hens look horrible, their backs are almost bare. This started back in September, they were looking better and then this morning I went to the coop and a ton of feathers in the coop, opened the roosting box and more feathers. What is going on does this sound like they are still molting? Egg production is down, I never see any aggression between my hens but I do know the youngest girls are at the bottom of the pecking order. I have one rooster but haven’t seen him mounting but occasionally (nothing like back in the spring). Any ideas would be greatly appreciated!