The article presents the results of immunogenetic studies of Simmental cows both by herd and by individual genealogical lines. During the first survey of the herd, about 100 alleles were identified in the blood B-system, including 15 most common in the herd. Such alleles were compared to 71.0 % of animals, and remaining 28.4 % were of a different rare alleles. Immunogenetic monitoring made it possible to follow the movement of genetic information in generations, to control the gene pool of the herd and to change it in a targeted way. The second survey (after 10 years) showed that the total number of alleles in the herd decreased, but the most common alleles were already 86.7% of animals, the rest (13.3%) had rarely encountered alleles. The ratio and frequency of B - alleles in the main lines of the herd – Florian 374, Fasadnik 642 and Margel 2122-also changed, which is associated with an increase in their genetic similarity. So, if according to the results of the first survey, the index of genetic similarity between the lines of Florian 374 and Fasadnik 642 was equal to 63%, Florian 374 and Margel 2122-51%, Fasadnik 642 and Margel 2122-60%, now these indicators are 74, 61 and 78.5%, respectively. The best milk productivity is distinguished by animals of Florian 374 line, their average milk yield for 305 days of the first lactation is 3878 kg with 3.88 % fat content in milk. In animals of the Fasadnik 642 and Margel 2122 lines, these indicators are 3472 kg and 3.92 %, and 3331 kg and 3.91%, respectively. The maximum difference in milk yield between animals with different blood B-alleles was 994 kg, the fat content in milk was 0.34 %, and the live weight was 85 kg, with a high degree of reliability of these differences.
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