Red cell blood groups of East African Zebu cattle*

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Abstract
A total of 146 East African Zebu, 41 Zebu-Hereford crosses and 24 Ayrshire-Norwegian Red Cattle crosses were investigated with cattle red cell reagents characterizing blood factors in 11 systems. With a battery of 36 selected reagents the average number of blood factors in Zebu was 20.1, which differs significantly from the average of 12.5 in the Ayrshire crosses. Factor frequencies for the A, C and S systems and gene frequencies for the F, L, M, Z, R'' and T'' systems are presented. The B system factors in 4 Zebu bulls could be grouped into 8 different phenogroups by utilizing the blood types of dam-offspring pairs.