Siwaporn Paengkoum และผู้แต่งคนอื่นๆ. (2010) The Effect of Roughage and Urea Solution Infusion Levels on Ruminal NH3-N Concentration and Nutrient Digestibility in Beef Cattle and Swamp Buffaloes. <i>Silpakorn University Science and Technology Journal</i>, <i>4</i>(1), 47-55.Siwaporn Paengkoum และผู้แต่งคนอื่นๆ. "The Effect of Roughage and Urea Solution Infusion Levels on Ruminal NH3-N Concentration and Nutrient Digestibility in Beef Cattle and Swamp Buffaloes". Silpakorn University Science and Technology Journal 4 (2010):47-55.Siwaporn Paengkoum และผู้แต่งคนอื่นๆ. The Effect of Roughage and Urea Solution Infusion Levels on Ruminal NH3-N Concentration and Nutrient Digestibility in Beef Cattle and Swamp Buffaloes. Silpakorn University Research and Development Institute:ม.ป.ท. 2010.