TY - JOUR T1 - Methane production of two roughage and total mixed ration as influenced by cellulase and xylanase enzyme addition JO - Scientia Agricola A1 - Gemeda, Belete Shenkute A1 - Hassen, Abubeker SN - 0103-9016 UL - 10.1590/0103-9016-2014-0155 VL - 72 Y1 - 2015 PB - scielo ER -