Over the 5 years I have raised chickens I have settled on Texas Natural GMO free pelleted 18% protein feed that I have started feeding fermented. Scratch daily in the AM made from wheat, milo and BOSS. I also toss about 3 C into the fermenting feed. They also get "treat" daily in the evening based on fruit waste from a local fruit arrangement vendor to which I add leftovers, canned corn or green beans and either black beans or black eyed peas and of course the most favored thing, bread. I attempt to grow sweet potatoes, squash, melons, milo, sun flowers and millet to use as a real food supplement. I am using cover crops that can serve this purpose in my soil remediation work also. In the short time I have been raising chickens feed prices have doubled at least.
I sell my eggs as fast as the girls lay them and have had numerous calls about the quality and flavor. (Folks just are amazed at the difference from store eggs)
Why: I avoid GMO foods personally and don't think it wise to feed the chickens foods that may affect fertility, I attempt to grow as much supplemental as possible, though gardening in north central TX seems like gardening in Hell. Looks like this year I will have lots of sweet potatoes for winter use, and will try to grown squashes and other hot weather stuff since it is still nearly 5 months until first frost. Why I bother fermenting their feed is to save money. Since it is a new thing, I can only say with fermented feed, they are not spreading it all over the back porch to bait grasshoppers. Never thought the girls were that subtle (or lazy) until this summer-must be the New Hampshire reds.