POLYMORPHISMS IN BETA AND KAPPA-CASEIN ARE NOT ASSOCIATED WITH MILK PRODUCTION IN TWO HIGHLY TECHNIFIED POPULATIONS OF HOLSTEIN CATTLE IN MEXICO - T. Duifhuis-Rivera; C. Lemus-Flores; M. Á. Ayala-Valdovinos; D. R. Sánchez -Chiprés; J. Galindo-García; K. Mejía-Martínez; E. González-Covarrubias (Journal of Animal and Plant Sciences, 2014)