To provide a feed additive added to feed for livestock, poultry, pet animals, etc. and effectual in effectively reducing the stench of dung excreted from animals, and to provide mixed feed mixed with the feed additive.

A feed additive contains at least one kind of lactobacillus belonging to Lactobacillus such as Lactobacillus fermentum, Lactobacillus brevis and Lactobacillus furctivorans; Bacillus natto such as Bacillus subtilis var. natto; and a vegetable shaping agent such as used tea leaves and yeast fermentation lees. The feed additive is a granular or powdery solid. The feed additive is mixed into feed for animals to obtain mixed feed effectual in reducing a stench caused by animal wastes.