The aim of the work has been to characterize the Red-White breed on the basis of their blood groups. The blood samples of Red-White breed from Wroclaw region formed the materials for the studies. 5390 head cattle have been examined and 72 B-alleles were found among them, their number in groups ranging from 26 to 64. In most cases, the B-phenogroups occurring most frequently were statistically significant. In the group of sires, the least number of significant differences occurred.