Probiotics as a technology to lower antibiotic use according to a recently published literature review.
A literature review conducted by the University of Bologna (Italy) on how probiotics can limit the use of antibiotics was published. 131 scientific papers were included in this publication evaluating the effectiveness of bacillus-based probiotics on a broad array of modes of action such as having a positive effect on the gut microbiota, gut integrity, immune-modulatory actions, and performance of pigs and chickens.
The review concludes that bacillus-based probiotics can reduce post-weaning diarrhea by 30% as well as improve performance parameters such as average daily gain and feed conversion ratio. The authors further conclude that bacillus-based probiotics can be a potential technology for lowering the need for antibiotic use in pig production.

Luise D, Bosi, P, Raff L, Amatucci L, Virdis S, Trevesi P.
Bacillus spp. Probiotic Strains as a Potential Tool for Limiting the Use of Antibiotics and Improving the Growth and Health of Pigs and Chickens. Front. Microbiol., 07 February 2022