Animal nutrition compositions include a carrier and a fermentation product applied to the carrier. Liquid fermentation products are fluidly applied to dry carriers, such as phyllosilicates or other earthen components, while mixing and applying air flow, under appropriate temperature and pH conditions, to bind the fermentation product to the carrier and dry the reaction product to appropriate moisture content. Fermentation products are also mixed with liquid carriers, such as water. Fermentation products include components of a microbial fermentation culture, such as liquid medium, microbial cellular components, and fermentation metabolites produced by microorganisms. Some compositions include a pH buffering agent and/or additional components to further enhance beneficial effects of the composition, such as improved weight gain and feed conversion, reduced gut lesions, harmful gut bacteria count, and decreased mortality. Compositions can be mixed with animal feeds or otherwise administered. Compositions can inhibit fungal growth on animal feeds.