FIELD: cattle breeding. SUBSTANCE: in order to increase selection effect, cattle is tested for blood groups and couples are selected with different heterozygosity levels: female animals with minimum heterozygous loci are coupled with male animals having maximum number of heterozygous loci, and vice versa. Thus largest number of animals with heterozygosity levels from 4 to 6 loci are obtained and thereby productivity and fertility levels are increased and upgrowth of animals is improved. EFFECT: enabled controlling heterozygosity levels for all blood group loci. 4 tbl, 2 ex
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