I have 8 Bantams (7 months old) and 5 RIR (adult) in my back yard. They are into a 15x30 covered fenced area with a coop, and I feed them scratch grain and occasionally grass. I also give them food leftover almost every day. I try to raise them "organic" with no animal by-products. However since two of them start to lay eggs and I don't have much grass anymore ( new house with very little grass around) I was wondering if they get enough nutrients from the grain they get (corn and wheat). I bought yesterday a bag of Layena Purina Brand 16% chicken food and on the bag says that is not good for chicken under 18 weeks old. Mine are past the 18 weeks, but the reason I'm concern is because I'm trying to raise my chicken organic and don't understand what is in this food that is dangerous for younger chicken? Can I mix this food with their scratch grain and still be "organic"? THIS IS WHAT I HAVE ON THE LABEL: Processed Grain By-products Grain products, Calcium, Carbonate, Plant Protein Products, Salt, Monocalcium Phosphate, Dicalcium Phosphate, Methionine Supplement, Tagetes Extract, Choline Chloride, Vitamin E Supplement, Riboflavin Supplement, Manganous Oxide, Calcium Pantothenate, Menadione Sodium, Bisulfite Complex, Vitamin B-12 Supplement, Vitamin A Supplement, Niacin Supplement, Folic Acid, Vitamin D3 Supplement, Hydrolyzed Yeast, Zinc Oxide, Distillers Dried Grain with Solubles, Copper Sulfate, Hydrated Sodium Calcium Aluminosilicate, Calcium Iodate, Sillicon Dioxide, Sodium Selenite.