1. Forage Cell Wall Structure and Digestibility;Galyean,1993
2. Nutritional Ecology of the Ruminant;Van Soest,1982
3. AOAC Method 2.051, Official Methods of Analysis, AOAC Int., Gathersburg, MD.
4. AOAC Method 990.03, Official Methods of Analysis, AOAC Int., Gathersburg, MD.
5. Forage fiber analysis (Apparatus, Reagents, Procedures, and some Applications);Goering,1970