Phuong L T B, Preston T R, Van N H and Dung D V 2019: Effect of additives (brewer’s grains and biochar) and cassava variety (sweet versus bitter) on nitrogen retention, thiocyanate excretion and methane production by Bach Thao goats. Livestock Research for Rural Development. Volume 31, Article #1. Retrieved , from http://www.lrrd.org/lrrd31/1/phuong31001.html