Provided are a feed additive composition for breeding a hog which removes the specific odor of a hog and enhances immunity, and the pork which is produced by using the composition and is free from the specific odor of a hog. The feed additive composition is an ion aqueous solution which contains 25-40 wt% of at least one kind of metal cation selected from the group consisting of Fe^2+, Mg^2+, Mn^2+, Ca^2+, Co^2+, K^+, Cu^2+ and Zn^2+ based on the total aqueous solution. Preferably the feed additive composition is added to feed in an amount of 0.01-5 wt% to the total weight of feed.
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