I.U. Udo and U.E. Umoren
Asian Journal of Agricultural Research 5 ( 3 ): 164 - 175 , 2011
Asian Journal of Animal Sciences 5 ( 5 ): 340 - 348 , 2011
U.E. Umoren, M.A. Isika, E.P. Asanga and P.N. Ezeigwe
Pakistan Journal of Biological Sciences 10 ( 14 ): 2368 - 2373 , 2007