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Influence of Mastitis on Properties of Milk XI. Fat Globule Membrane¹

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

ABSTRACT

The effect of mastitis on the milk fat globule membrane of milk samples from individual quarters was investigated. Wisconsin Mastitis Test positive (>20mm) milk contained approximately 10% less milk fat globule membrane material than negative (<10mm) milk. The lipid portion of the milk fat globule membrane preparation from positive milk contained smaller amounts of phospholipids and larger amounts of cholesterol. Milk fat globule membrane preparations from positive milk had higher aldolase activity and lower xanthine oxidase activity. Dissociated membrane protein prepared from positive milk was resolved into five components by polyacrylamide gel electrophoresis while the membrane protein prepared from negative milk was resolved into three components.

¹ Technical paper 10875 of the Texas Agricultural Experiment Station, College Station.

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