1405-3195 1405-3195 S1405-31952006000200163 Mexico Mexico Mexico 00 04 2006 00 04 2006 40 2 163 170

Aviagen 2003 1995 74 360-5 2003 60 3 3 441-5 1998 55 151-9 1999 12 548-53 1998 77 445-8 1995 43 1 1 77-85 INRA (Institute National de la Recherche Agronomique) 2001 14 171-80 1997 76 1264-71 1998 77 416-25 2004 NRC (National Research Council) 1994 Ninth 1993 5 561-2 1996 75 1086-91 SAS Institute 1999 1-5 2000 1 70-1 WHO (World Health Organization) 1996 123-43 2003 2003