In the course of their history Belarus Red cattle were repeatedly improved by infusion of the blood of the superior related red breeds. During the last 100 years the blood of six breeds was used, Angeln and German Red at the end of the last and early in this century, Polish Red and Danish Red in the twenties and thirties, and Estonian Red and Latvian Brown in the fifties of this century. The blood of Danish Red cattle is currently being introduced again.