I have read that one of the problems with chickens during the winter is boredom. Because things aren't growing, there's not much for them to eat or play with. The boys will start fighting and the girls will start pulling feathers. One idea was to provide something for them to play with that they can also eat - like a head of cabbage. So I tried it out. I was disappointed that my chickens didn't seem to notice it or know what to do with it. I'm going to try grubs next.