I have 5 chickens, a mixed breed from Tractor Supply that started loosing their feathers this spring. They have large bald spots, first all around their tails, then on their legs. They eat, lay eggs everyday, and seem normal except for the loss of feathers. I checked them very well for lice and saw nothing. Its been 6 months now and they still don't have their feathers back. It looks like some are starting to come in, but I still find a lot of large feathers in the coop and run. I'm afraid they're going to freeze their butts off. It's getting cold outside. I changed their food last week from the regular layer feed to one that has extra vitamins and Omega 3. Thought maybe a better food would help. I didn't think molting lasted this long? Are they molting or could it be something else? They were just over a year old when it started this spring.