PENGARUH ARAS UNDEGRADED PROTEIN DAN ENERGI TERHADAP KINETIK FERMENTASI RUMEN DAN SINTESIS PROTEIN MIKROBA PADA SAPI [Effect of Undegraded Protein and Energy Level on Rumen Fermentation Parameters and Microbial Protein Synthesis in Cattle] - Widyobroto, B.P (Faculty of Animal Agriculture, Diponegoro University, 2007)