Feed your ducks from day one into happy adulthood. Purina(R) Duck Feed is specifically formulated to meet the elevated niacin levels ducklings need to grow and adult ducks need to maintain proper health. Our balanced formula is complete and can be fed to ducks as their sole diet from the moment they hatch through their entire life. Supplement this diet for laying ducks with Purina(R) Oyster Shell for added calcium.