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Influence of Mastitis on Properties of Milk. VII. Distribution of Milk Proteins¹

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

The effect of mastitis on protein distribution in individual quarter milk samples was investigated by densitometric measurement of polyacrylamide gel electrophoresis patterns of proteins. Wisconsin Mastitis Test positive (>20mm) milks contained relatively higher concentrations of bovine serum albumin, proteose peptone, immunoglobulin, _s- and -caseins and lower concentrations of ß-lactoglobulin and ß-casein than the corresponding negative (Wisconsin Mastitis Test <10mm) milks. There was no change in the distribution of -lactalbumin. Unidentified fast-migrating bands were apparent in both whey protein and casein fractions from positive milks.

¹ Technical paper 10160 of the Texas Agricultural Experiment Station, College Station.

² Present address: National Vitamin Products Co., Minneapolis, Minnesota 55406.

³ Present address: Dairy Science Department, University of Florida, Gainesville 32601.