1. Adejumo, J., and Ademosun, A. 1991. Utilization of leucaena as supplement for growing dwarf sheep and goats in the humid zone of West Africa. Small Ruminant Research. 5, 75-82
2. AOAC. 1990. Official Methods of Analysis of the Association of Official Analytical Chemist. 15th Ed. Washington, D.C, (USA)
3. Calsamiglia, S., Ferret, A., Reynolds, C., Kristensen, N., van Vuuren, A. 2010. Strategies for optimizing nitrogen use by ruminants. Animal. 4, 1184-1196
4. Fenton, T., and Fenton, M. 1979. An improved procedure for the determination of chromic oxide in feces. Canadian Journal of Animal Science. 59, 631-634
5. García, D., Medina, M., Cova, L., Torres, A., Soca, M., Pizzani, P., Baldizán, A., Domínguez, C. 2008a. Preference of cattle for the foliage of twelve species with potential for agrosilvopastoral systems in the Trujillo State, Venezuela. Pastos y Forrajes. 31, 255-270