Provided is an animal feed additive including: 20 to 50 wt % of a salt of lactic acid and stearic acid ester； and 50 to 80 wt % of one kind of salt selected from the group consisting of a salt of lactic acid and palmitic acid ester, a salt of lactic acid and lauric acid ester, and mixtures thereof. The lactic acid is a monomer or a dimer. The salt is a sodium salt, a calcium salt, or a potassium salt.
