I also feed Flock Raiser, a 20% protein feed suitable for all chickens, with oyster shell on the side. My flock ranges on varied ground, lots of stuff for them to find. I feed very limited other stuff. Most chicken feeds are 'vegetarian' because it's less expensive to produce, totally balanced, and many people have no idea that chickens are omnivores. I think that the 16% protein layer feeds work best only if they aren't 'toned down' with random vegetable scraps, which unbalance the very fine- tuned feed, which is formulated for commercial birds who get nothing else. As aart mentioned, offering other vegitation changes the diet, sometimes for the worse. Mary