Chapter. 1. Yeast as a source of exogenous enzymes in feeding ruminants -- Chapter. 2. Yeast culture and direct-fed microbes: Modes of action and beneficial applications in ruminants -- Chapter. 3. Effects of Exogenous Enzymes on the Nutritive value of some Fibrous Forage in Ruminants -- Chapter. 4. Exogenous fibrolytic enzymes: for the better utilization of Guinea grass and rice straw as ruminant feeds -- Chapter. 5. Role of Exogenous Enzymes in Feed Digestibility and Reducing the Emission Intensity of Enteric Methane Production in Ruminants -- Chapter. 6. Inclusion of exogenous fibrolytic enzymes in the diets of dairy cows and ewes: Effect on milk yield and milk composition -- Chapter. 7. Determining the Effect Enzyme Addition to Locally Available Forages in Mongolia Using In Vitro and In Vivo Techniques -- Chapter. 8. Fungi as a source of exogenous enzymes to feed ruminants -- Chapter. 9. Dietary inclusion of exogenous fibrolytic enzyme in southern China to enhance fibrous feed utilization by goats and cattle.