1. AOAC, 1984. Official Methods of Analysis, 14th Edition. Association of Official Analytical Chemists, Washington, DC.
2. en reemplazo de heno de alfalfa. 1. Effecto en el consumo, peso vivo y produccion de leche;Azocar;Adv. Prod. Anim.,1996
3. Urinary excretions of purine derivatives and nitrogen in sheep given straw supplemented with different sources of carbohydrates;Balcells;Anim. Prod.,1993
4. Ben Salem, H., 1998. Effets de l’Acacia cyanophylla Lindl. sur l’ingestion et la digestion des régimes destinés aux ovins. Rôle des tanins et perspective d’amélioration de sa valeur alimentaire. Thèse Doctorat de l’Université de Dijon, France, 252 pp.
5. Effect of increasing level of spineless cactus (Opuntia ficus-indica var. inermis) on intake and digestion by sheep given straw-based diets;Ben Salem;Anim. Sci.,1996