For increased protein for your birds, also consider growing your own mealworms (never-ending supply once you get the initial batch - lots of good threads on BYC covering the how to details) and don't forget your compost pile - it's a great source of bugs for the chickens too. During the winter, we often get a tractor scoop full of hot compost and dump it into the chicken run - it is full of grubs and lots of other treats for the chickens and they get to warm their toes while digging around in it. Some folks even use the deep litter method in their runs so you don't have to move the compost - and the chickens help aerate it and speed the decomposition process. Plenty of added fertility for your soil in spring so you can keep growing more goodies.