Performance-Enhancing Nutrition for Every Animal For generations, Calf-Manna? has helped animals reach their peak condition. As a performance-enhancing supplement for multiple species of animals, Calf-Manna has been part of the community for more than 80 years, helping your animals grow healthy and strong. Calf-Manna delivers a wide range of nutritional benefits to every animal, from horses, cattle, rabbits, and goats to poultry, pigs, and deer. See the Calf-Manna difference, and help your animals reach their full potential.