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PURPOSE : A feed additive containing an organo-rare-earth element compound is provided to replace high concentration copper and zinc for using as a feed, for minimizing side effects.CONSTITUTION : A feed additive contains an organo-rare-earth element compound obtained by mixing a rare-earth element compound solution selected from (RE)Cl3, (RE)NO3, and (RE)2O3, with a yeast peptide solution, and drying the mixture. Rare-earth element inside the rare-earth element compound solution is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium.COPYRIGHT KIPO 2011