The relation between transferrin locus and the breeding quality traits of our country cattle race: lowland black-white and lowland red-white.

The relation between transferrin locus and the breeding quality, especially such traits as--milk quantity, fattening and fertility rate expressed through nine traits, were analyzed. There are presented some results of phenotypes distribution and frequency of alleles of transferrin. Changing of allele frequencies in time in certain direction was observed. The calculated coefficients of regression of frequency on a year in race lrw were: bA = -0.0080; bD = 0.0137; BE = -0.0057 and in race lbw: bA = 0.0134; bD = -0.0034; bE = -0.0089.