Hemoglobin samples of 108 Korean cattle and 60 holstein were studied by starch gel electrophoresis. Genetic polymorphism of hemoglobins was established in korean cattle and holstein. 1) Hemoglobin types from 108 korean cattle and 60 holstein were as follows: 86 of Hb-AA, 18 of Hb-AB, 3 of Hb-AC, 1 of Hb-BB in korean cattle and 60 of Hb-AA in holstein. 2) These figures correspond to the frequencies: Korean cattle was Hb^A=0.895, Hb^B=0.071, Hb^C=0.014 and holstein was Hb^A=1.000. Phenotypes Hb-AA and Hb-AB had the highest frequencies in korean cattle, whereas Hb-BBand Hb-Ac occur very rarely and the homozygote HbCC and Hb-BC were not recognized.