Abstract: Poultry liver hydrolysate is added to animal food compositions in amounts sufficient to enhance palatability, preferably in amounts of from about 0.01% to about 6% by weight of the composition. The compositions containing poultry liver hydrolysate are ingested more frequently and at a higher rate by animals, particularly finicky animals or older animals that tend not to eat enough food to maintain their health.

Abstract: The present invention provides methods for enhancing the quality of life of a growing animal by feeding the animal a quality of life enhancing amount of a composition comprising about 10% by weight protein, about 4% by weight fat, and about 0.05% by weight of at least one omega-3 polyunsaturated fatty acid. Enhanced quality of life is shown by an improvement in one or more characteristics selected from the group consisting of trainability, cognitive function, motor skills coordination or agility, retinal development, cartilage protection, maintenance of muscle mass, and skin and pelage quality.