SummaryFrom a comparative survey of reports on cattle Hb variants it is concluded that prior to the present communication the occurrence of at least seven different adult Hb molecules have been reported.In addition comes the finding of a new Hb variant called HbG which is reported in this study. This was found in three animals among 101 East African Zebu cattle. It migrated more slowly than any cattle Hb variant previously reported and made up 20% of total Hb.The gene frequencies of the East African Zebu population were:HbA= 0.52,HbB= 0.32,Hbc= 0.14 andHbG= 0.01.