The invention relates to direct-fed microbials for use in E. coli, Salmonella, and/or Campylobacter inhibition in animals. More particularly, the invention relates to isolated Bacillus strains A12, 54, 681, 101, 235, and 721, and strains having all of the identifying characteristics of these strains, for a use comprising the above-mentioned use. The invention also relates to the use of isolated Bacillus strains 681,721, A12, 54, 86, 300, 101, 102, 235, and 177, and strains having all of the identifying characteristics of these strains, to prevent or reduce prolapse in an animal.