I increase the protein content in my hens' feed during the winter and particularly after molting, since feathers are principally comprised of a protein called keratin. I mix game bird food 1:1 with my laying crumbles. The game bird food has more protein than laying rations, so when mixed, you get an increase in overall protein content without overloading on protein. Also, I save eggs throughout the year and hard-boil them and mash them up, shell and all and freeze them for future use. When the girls need extra protein, I thaw a large bag and mix with raw oatmeal and some flax oil. They love it and it gives them extra nutrition in addition to their daily scratch and layer crumble. I also increase protein in the hens' diet when I plan to incubate eggs for hatching.