PROBLEM TO BE SOLVED: To easily provide an animal feed which contains apple polyphenols and is safe for growth of animals.SOLUTION: The animal feed is obtained by mixing a feed material with 5-50% of an unripe apple residue by weight. Consequently apple polyphenols are biologically concentrated in animal bodies to which the animal feed is fed and simultaneously animals do not cause an insufficient growth due to a deficiency of nutrients contained in the feed material.