“…Milk protein genes, however, are associated with the quantitative variation of the proteins for which the codominant alleles are coding. Moustgaard et al (1960), Golikova and Panin (1972), Michalak (1973), Cerbulis and Farrell (1975), Komatsu et al (1977), Mariani et al (1979), McLean et al (1984), Ng-Kwai-Hang et al (1987) and Aaltonen and Antila (1987) Huisman, 1968). Such different rates of expression of globin genes appear to be even more marked in Hb-C heterozygotes (Boyer et al, 1963;Itano, 1965) and in thallasemias (Na-Nakorn and Wasi, 1970;Huisman et al, 1972 In Sirrcmental cows 2 samples were analysed from nearly every cow.…”