In the article are presented the results of studied animals of the Aberdeen-Angus breed by blood groups. The highest frequency of antigens B2, G3, Y2, G ', Q', G" (EAB locus), antigens C1, C2, E, W and X2 (EAC locus) was detected. There is a high incidence of allele B1G1 (0.0913), which is accessible to us from literary sources, is met only at Holstein cattle of the Yaroslavl breed and the red Estonian breed. The concentration of the main alleles in the herd PF "Juliana Gore" was 59.3%, rare - 30.4%, respectively. The homozygosity of the analyzed population of Aberdeen-Angus cattle is the lowest in comparison with the data available in the literature and is 0.31. This indicates a very high genetic diversity of this herd, the confirmation which serves the genophond of various breeds - German and Romanian, more detailed research will follow.