1. AOAC, 1990. Official Method of Analyses, 15th ed. AOAC Inc., Arlington, Virginia, USA.
2. Benamides, J.E., 1991. First Electronic Conference on Tropical Feeds and Feeding Systems. Research on Forage Trees (Retrived from FAO/ILRI CD-ROM 1999). FAO/ILRI, Rome, Italy.
3. Seasonal nutritional characteristics of livestock diets in a nomadic pastoral ecosystem;Coppock;J. Appl. Ecol.,1986
4. Elmi, A.A., 1989. Nutrient content of camel diets in ceeldheer district. management, foraging behaviour, diet composition and forage qulity of free ranging but herded camels in Ceeldheer District, Central Somalia. Ph.D dissertation, pp. 128–150.
5. Agro-ecology, cultivation and use of cactus pear. FAO plant production and protection paper 132;Falker,1995