I have a group of 10 chickens in Northwest CT that are slowly losing feathers.... please help. They are all hens and approx. 9-10 months old and multiple breeds (welsummers, wyandottes, cuckoo maran, buff orphington, buckeye, and 2 easter eggers). They have a 6 x 8 x 10 (tall) shed that they live in with 4 nesting boxes, 5 x 8 outdoor recycled dog kennel and free access to a 35 x 35 fenced in garden where they "semi-free" range daily. I have a light on from 5am to 6pm. They get a handful of scratch feed with their Blue Seal layer pellets. Over the past 2-3 months I have slowly noticed that approx. 6/10 chickens are losing their feathers. Most of the feather loss is around the preen gland, vent and neck (1 hen) The other 4 appear completely unaffected. I have tried everything recommended to me and from past threads: 1) increased protein with organic yogurt, cottage cheese, sunflower seeds and tuna 2) Dusted them twice with DE 3) Added a fresh dust bath with ashes, dirt, and DE (they appear to be loving it) 4) Increased treats to keep them busy (seed blocks, cabbage piñata, etc.) 5) Checked them a million times for lice (I'm a small animal vet so hopefully I would be able to see them) 6) Added vitamins to their water They all appear to be otherwise happy and egg production has not been reduced. Any advice would be much appreciated..... Am I at the point where they are all going to need one of the duct tape aprons mentioned in past threads Thanks in advance!