I am realatively new to chicken rearing, so this is my first encounter with something not right with my birds. We first noticed 1 year old hen beginning to lose feathers around her tail, the feathers look broken off and frayed...this has been going on for quite a while, long enough to not be molting. Then it has spread to another 5 hens, all in various stages of looking very rough. We did have a period of sneezing, which has subsided. The hen that was sneezing is not effected with this feather condition. I have inspected them closely, and see no signs of mites or lice, and the skins appears pale (normal??). Does anyone have any idea what is troubling these poor birds?