i have two small hens that are at the bottom of the pecking order. the one has a completely bald butt, she lost all of her feathers. the other one only has a couple left. i want to know why they seem to only go after the tail feathers and why they keeping pecking the bald spots even after we spray blu-kote on them. i was told it would discourage pecking on that spot but it hasn't. im a little concerned, as we keep going through random periods of warm and then really cold weather. i dont want the girls getting sick or dying because they cant keep warm.