Almaraz I, 2010, ITAL J ANIM SCI, V9, P6, DOI 10.4081/ijas.2010.e2; AOAC International, 1995, OFFICIAL METHODS ANA, V1; Avellaneda-Cevallos JH, 2007, AGRON MESOAM, V18, P11; Barrera-Islas GA, 2007, CURR MICROBIOL, V54, P266, DOI 10.1007/s00284-006-0105-7; Beauchemin KA., 2003, J ANI SCI, V81, pE37, DOI 10.2527/2003.8114\_SUPPL\_2E37X, 10.2527/2003.8114\_suppl\_2E37x; BEDFORD MR, 1995, ANIM FEED SCI TECH, V53, P145, DOI 10.1016/0377-8401(95)02018-U; Carreón L, 2010, ITAL J ANIM SCI, V9, P83, DOI 10.4081/ijas.2010.e17; Chesson A., 1988, The rumen microbial ecosystem., P251; Giraldo LA, 2007, BRIT J NUTR, V98, P753, DOI 10.1017/S0007114507744446; Hernández PA, 2011, AFR J MICROBIOL RES, V5, P961; Krueger NA, 2008, J ANIM SCI, V86, P882, DOI 10.2527/jas.2006-717; Lewis LA, 1996, J ANIM SCI, V74, P3020; Liu J, 2006, PROCESS BIOCHEM, V41, P2347, DOI 10.1016/j.procbio.2006.05.014; Lopez S.M.A., 2006, REV VET MEXICO, V37, P275; Martínez-Trujillo A, 2003, ENZYME MICROB TECH, V32, P401, DOI 10.1016/S0141-0229(02)00313-7; Mayorga-Reyes L, 2002, FEMS MICROBIOL LETT, V214, P205, DOI 10.1111/j.1574-6968.2002.tb11348.x; McAllister T.A., 2001, ENZYME FARM ANIMAL N; Mejia-Castillo T, 2008, BIOTECHNOL LETT, V30, P681, DOI 10.1007/s10529-007-9589-x; Oba M, 1999, J DAIRY SCI, V82, P589, DOI 10.3168/jds.S0022-0302(99)75271-9; Pinos RJM, 2002, J ANIM SCI, V80, P3016; Pinos-Rodríguez JM, 2005, INTERCIENCIA, V30, P752; Roy I, 2004, BBA-PROTEINS PROTEOM, V1698, P107, DOI 10.1016/j.bbapap.2003.11.003; Sánchez-Herrera LM, 2007, APPL MICROBIOL BIOT, V77, P589, DOI 10.1007/s00253-007-1190-7; SAS, 2002, SAS US GUID STAT REL; Steel G.D.R., 1997, PRINCIPLES PROCEDURE, P666; Sutton JD, 2003, J DAIRY SCI, V86, P546, DOI 10.3168/jds.S0022-0302(03)73633-9; Treacher R., 1997, Canadian Journal of Animal Science, V77, P541; VANSOEST PJ, 1991, J DAIRY SCI, V74, P3583, DOI 10.3168/jds.S0022-0302(91)78551-2; VanSoest PJ, 1994, NUTR ECOLOGY RUMINAN, V2, P374; Vanzant ES, 1998, J ANIM SCI, V76, P2717; Wallace RJ, 2001, J ANIM SCI, V79, P1905; Yescas-Yescas R, 2004, AGROCIENCIA-MEXICO, V38, P23