1. ANKOM (2010) ANKOM technology instrument manuals. http://www.ankom.com/instrument-manuals.aspx . Accessed 12 Feb 2012
2. AOAC (1980) Official method 4.2.11. Protein (crude) in animal feeds, forage (plant tissue), grain, and oilseeds. In: Official methods of analysis of AOAC International, 13th edn. AOAC International, Washington, DC
3. AOAC (1997) Official method 973.18. Fiber (acid detergent) and lignin in animal feed. In: Official methods of analysis of AOAC International, 16th edn. AOAC International, Washington, DC
4. Boschini FC (2006) Nutrientes digeribles, energía neta y fracciones proteicas de la morera (Morus alba) aprovechables en vacas lecheras. Agronomía Mesoamericana 17(2):141–150
5. CONAGUA (2008) Base de datos electrónica de la Comisión Nacional del Agua. Boca de Río, Veracruz, México