Bovine a-Lactalbumin C and aS1-, ß- and ?-Caseins of Bali (Banteng) Cattle, Bos (Bihos) Javanicus

Abstract

An electrophoretic examination is made of milk samples taken from eight Bali (banteng) cattle, Bos (Bibos) javanicus, at Beatrice Hills, Northern Territory, Australia. Starch-gel electrophoresis at pH 8� 5 (NaOH-H3B03 buffer) and filter-paper electrophoresis at pH 8� 6 (diethylbarbiturate buffer) indicate that all samples contain a new a-lactalbumin variant, designated a-lactalbumin C. The order of mobility for bovine variants is A > B > C. The C variant differs from the common B variant in having one more amide residue (substitution of Asn for Asp or GIn for Glu).