An additive for feeds is provided which is efficacious in preventing and ameliorating digestive disorders such as diarrhea occurring as the side effects of the administration of antibiotics and a feed containing same. More specifically, an additive for feeds which comprises (A) Lactobacillus equi cells and (B) cells of at least one bacterium selected from the group consisting of Lactobacillus salivarius, Lactobacillus crispatus and Lactbacillus johnsonii.