Embodiments of a composition comprising three or four Bacillus species selected from Bacillus amyloliquefaciens, Bacillus subtilis, Bacillus licheniformis and Bacillus coagulans are disclosed. The composition may further comprise, or be used in combination with, feed and/or feed supplements, including feed supplements comprising yucca, quillaja, silica, mineral clay, glucan, mannans, or combinations thereof. Also disclosed is a method of administering the composition and/or combination to animals, such as poultry.
