Land O'Lakes Purina 0044570 Grit Supplement, 5-Pound 5 Lb. Grit Supplement Helps Support Healthy Digestion In Adult Chickens, Turkeys and Game Birds Crushed Granite Helps Support This Digestion Should Have A Separate Hopper For Grit Supply That Is Constantly Filled Grit Is Necessary To Help The Gizzard Work Efficiently