Prayitno C H, Suwarno and Susanto A 2015: In vitro assessment of digestibility and rumen fermentation of ammoniated rice straw based beef diet, supplemented with extract of garlic and Sapindus rarak. Livestock Research for Rural Development. Volume 27, Article #94. Retrieved , from http://www.lrrd.org/lrrd27/5/pray27094.htm