Inthapanya S, Preston T R, Phung L D and Ngoan L D 2017: Effect of supplements of yeast (Saccharomyces cerevisiae), rice distillers’ by-product and fermented cassava root on methane production in an in vitro rumen incubation of ensiled cassava root, urea and cassava leaf meal. Livestock Research for Rural Development. Volume 29, Article #220. Retrieved , from http://www.lrrd.org/lrrd29/12/sang29220.html