About a million years ago when I was a kid growing up on a little farm my mom had the healthiest chickens in Indiana. I remember that she always had a special wooden bucket with her when she worked in her big vegetable garden and filled the bucket with all sorts of cuttings, veggies, fruit, greens, worms, bugs and just about anything else she could gather from the garden. As she walked past the chicken run she would always toss the contents onto the ground in the run. I can remember seeing big chunks of RED CABBAGE in the piles. If memory serves me right the chickens never left a scrap of anything. There would always be a dozen, or so, little tiny chicks digging through the remains.
She was also a very prolific baker of breads, pies, cookies, and cakes. All of the waste from her kitchen went into the run also.