Sangkhom I, Preston T R, Khang D N and Leng R A 2012: Effect of potassium nitrate and urea as fermentable nitrogen sources on growth performance and methane emissions in local “Yellow” cattle fed lime (Ca(OH)₂) treated rice straw supplemented with fresh cassava foliage. Livestock Research for Rural Development. Volume 24, Article #27. Retrieved , from http://www.lrrd.org/lrrd24/2/sang24027.htm