C.A. Kiddy

Polymorphism of γ-casein in cow's milk

Abstract γ-Casein occurs in two forms, designated A and B, as measured by disc-gel electrophoresis. The results of the typing of milk samples from 165 cows for β- and γ-casein suggest a genetic basis for the polymorphism of γ-casein and a close relationship in the synthesis of β- and γ-casein.

Amino acid analysis of the β-lactoglobulins from individual cows of two phenotypes

Abstract Amino acid analyses were performed on β-lactoglobulin samples prepared from individual dairy cows, 24 of which were homozygous for β-lactoglobulin A and 9 for β-lactoglobulin B. No differences were found in individual contents of any amino acids other than the previously known β-A-β-B difference amino acids. The total analyses agreed well with previously published analyses on β-A and β-B obtained from pooled milk of many animals.