Last night as I was locking the pullets up I noticed one of the Welsummers seemed to have ruffled feathers/missing feathers just in front of her tail. It was dusk and I couldn't see her very well. This morning I left for work before sunrise and opened the pop door and all the pullets were still on roost and I couldn't check them. I called a friend at noon to see if she could check my chickens and she has reported that two of the three Welsummers have bare backs and a Black Australorp is missing feathers!! I am beside myself until I can get off work and get home to take care of the pullets. Is this from a bully pullet?? Could they have lice/mites and this happen so sudden? I know the Welsummer is on the lower pecking order in my flock. I have a Speckled Sussex that seems more aggressive and had considered culling but NEVER did I see excessive feather pulling. I have been getting 10 to 14 eggs a day from my flock of 6 month pullets. They had seemed very healthy and happy. Egg production has been increasing by the week. HELP! My plan of attack when I get home is to check for mites/lice but this is the first flock of chickens on the property. I have seen no signs and these symptons are quite sudden. I have blue cote and plan to spray the injured birds. Is this the best solution? If there are no bugs how do I know for sure which pullets are the bully's? Surely it is more than one. And why all of a sudden? About a two weeks ago I had set a light on a timer to increase daylight hours (it turned on 2 hours before sunrise). Last night when I saw the Welsummer I pulled the plug on the light. I was afraid the extra light hours was stressing the flock. My husband says I fret over too much with these chickens-but now I really do have something to fret about!