I'm interested in doing a similar thing; use the search feature and you will find, with loads of reading, alternatives to feed chickens. One person cans fish scraps; I clean out the 'frig and give some meat to dogs and some to chicks (8 weeks). Some root vegies also mentioned. I'm thinking of canning more winter squash because the squash in the root cellar only lasts until Feb or March.
Not sure if this is reasonable, but I envision greens that last well into winter like kale; and drying others that grow in excess like spinach. My mother grew a huge sorrel plant, I remember it being 3 feet tall and wide, with huge leaves. Didn't need any special attention and grew up every year. Wish I could find sorrel.
WE grew and dried beans one year. let the pods dry on the vine and then harvest; seems chickens need the beans cooked before serving though. You might rethink who is fed first; feed you first and left overs to the chickens.
Start checking out free feed sources, like grocery stores and resturants. May be friends and neighbors, too. I have an aunt that call me when she cleans out her freezer: my dogs have a feast.
I'm sure there are many more ideas out there. GL