Harahap M A, Nuswantara L K, Wahyono F, Pangestu E and Achmadi J 2019: In vitro rumen fermentability of urea-limestone mixture combined with different sources of non-fiber carbohydrate. Livestock Research for Rural Development. Volume 31, Article #75. Retrieved , from http://www.lrrd.org/lrrd31/5/muham31075.html