Manna Pro Duckling & Gosling Starter Grower Crumbles. Crafted with everything your ducklings and goslings need. Vitamins and minerals ensure proper nutrition and healthy growth while 22% protein supports weight gain and muscle development. This formula is non-medicated and contains no added antibiotics. Whether you are raising your ducklings to be part of your backyard flock or as champion show birds, Manna Pro Duckling & Gosling Starter Grower Crumbles is the perfect way to help them grow up healthy and strong.