The present invention relates to use of an enzyme that cleaves both alpha- and beta-1,4-glycosidic bonds and, more particularly, the present invention provides -L-fucosidase which has -1,4-glucosidase and -1,4-galactosidase activities and thus is capable of producing glucose and/or galactose, which are monosaccharides, from non-fucosylated saccharides. The enzyme has transglycosylation activity and thus produces maltooligosaccharides having a higher degree of polymerization than maltooligosaccharides used as a substrate, thereby being applicable to the development of high-value-added new materials in the food industry.

Provided herein, inter alia, are methods for improving animal health (such as gut health) and performance as well as decreasing methane emissions via administration of an effective amount of a glycoside hydrolase capable of removing at least one alpha-1,2-L-fucose moiety from an intestinal mucin layer. Such methods improve animal health and performance without the need to administer potentially harmful antibiotics to the livestock.