Vongkhamchanh B, Preston T R, Leng R A, An L V and Hai D T 2018: Effect of biochar on growth performance of local “Yellow” cattle fed ensiled cassava roots, fresh brewers’ grains and rice straw. Livestock Research for Rural Development. Volume 30, Article #168. Retrieved , from http://www.lrrd.org/lrrd30/9/bobby30168.html