Corn is GMO and has gluten in many cases. Good you have a local corn that may not be cross contaminated. I don't do corn, soy, dairy, gluten. I have been trying to determine what I could feed my girls to remove the GMO as I tolerate the eggs when they eat corn, but I don't want to keep exposing myself to RoundUp and even gluten. I don't know if the metabolism of chickens converts the gluten enough for most people. I can't even find non-GMO seeds right now. I was going to grow my own corn this year.
My hens get plenty of veggies from the garden and all the leaves and pieces pulled off from cooking. But they can't totally free range as there are too many hawks and too little cover. I throw compost in the HUGE penned area to encourage bug growth for them. Also bales of straw for the same reason. I wonder how much uncooked rice they could tolerate? It would sure be easier to store and feed with it.
Chickens can have crab shells and shrimp shells, and left over meat. They love bone marrow and especially cracked chicken bones as they can get to it easier. (I don't tell them they're eating chicken bones--and they don't seem to care much anyway) They eat leftover stews. They aren't wild about some of the stuff, but then it becomes worm food, and the chickens DO love the worms.
I use various seeds and have been looking for a reasonably priced source of rice or lentils or peas. I also make suet for them with peanut butter or such, with table scraps and nuts. This sounds like I do much more than I do. I am only cooking for 1-2, so I can't do a huge flock. When I weed the garden or yard I throw all the weeds in the HUGE penned area.
I'd love to know if anyone finds a source or premixed GMO free gluten free feed.