L-arabinose isomerase catalyzes the isomerization reaction from D-galactose to D-tagatose,and has attracted more attention due to its importance in animal nutrition and food applied research. Animal rumen is a special anaerobic environment, and ruminal microorganisms contain large amounts of novel genes that code for polysaccharide-degrading enzymes. This study primarily analyzed the genetic diversity of L-arabinose isomerase in sheep rumen bacteria. Using the metagenome of rumen content extracted 4 h after...