The gastrointestinal tract is a complex anaerobic microbial ecosystem containing a vast assemblage of resident microorganisms performing a multitude of metabolic activities that play a key role in health and disease of humans and animals. Furthermore, the gastrointestinal microbes have a dominant impact on the growth and productivity of both ruminant and non-ruminant animals. This two-volume series on Gastrointestinal Microbiology reviews the literature and provides a comprehensive account of the biological significance of the microbiota present in the alimentary tract of a wide range of...