FIELD: medicine. SUBSTANCE: method involves testing animals on blood groups and their selection with B-locus alleles taken into consideration. Cows carrying Y1A'B''Y', D'E'F'G'O', O1Y1I', E'G'G''- alleles are used for remounting milch herd. A'O', QE'Q' and G1Y2E'Q' - alleles are considered to be undesirable, especially in the cases when both of them are present. EFFECT: prolonged service life of milch-cows for 1.5-2 lactation periods. 4 tbl
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