0187-5779 0187-5779 S0187-57792011000200133 Mexico 00 06 2011 00 06 2011 29 2 133 142

2001 29 28-30 2007 1999 21 650-3 2002 20 209-15 2004 629 415-9 1980 2002 20 391-9 1994 25 119-34 2001 20 196-204 1999 17 149-57 2001 19 19-27 Food and Agriculture Organization 2010 1981 2004 167-71 1999 210 263-72 1992 27 1254-5 1977 59 282-4 2001 13 48-53 2006 40 149-62 2004 38 261-72 Secretaría de Agricultura, Ganaderia, Desarrollo Rural, Pesca y alimentación 2010 2001 34 689-98 2005 28 55-61 SAS Institute 1999 2005 11 291-7 2006 United States Department of Agriculture 1994 1989 2001 19 75-81 2006 40 1-11 2001 2002 20 311-20 1971