Bartholomew P W, Ly R, Doumbia M, Khibe T, Kone N'g, Traore B and Ba S 2003: Agro-industrial by-products, cowpea residues and urea-treatment of hay for supplementary dry season feeding of mature zebu oxen in Mali. Livestock Research for Rural Development. Volume 15, Article #15. Retrieved , from http://www.lrrd.org/lrrd15/2/bart152.htm