Calcium propionate, the calcium salt of propionic acid, with the molecular formula 2(C3H6O2)CA, is a white crystalline fine powder or particles, odorless or with a slight odor of propionic acid, easily deliquescent in humid air. It is readily soluble in water and slightly soluble in ethanol. Calcium propionate is effective against mould, aerobic bacterium, gram-negative bacteria and aflatoxin in starch, protein-containing and greasy substances, and has unique anti-mould and antiseptic properties. In addition, as a feed additive, it can effectively inhibit mould and prolong the shelf life of feeds, and if combined with other inorganic salts, it can improve the appetite of livestock and milk production of cows.