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Spontaneous Lipolysis in Bovine Milk: Combined Effects of Cream, Skim Milk, and Lipoprotein Lipase Activity

Department of Animal Nutrition, Agricultural University of Norway, PO Box 25, N-1432, Ås-NLH, Norway

ABSTRACT

Total lipoprotein lipase activity has been studied in bovine milk. Lipase activity per milliliter milk decreased with decreasing yield in late lactation. Individual variation between cows was high, even at given milk yield. Evening samples were always higher in lipoprotein lipase activity than morning samples. This also applied to the degree of cold storage lipolysis (spontaneous lipolysis). However, the amount of liberated FFA per unit lipase was similar in morning and evening samples. Lipolysis in evening milk may be higher due to increased lipase. Methods to quantitate the influence of the skim milk fraction on lipolysis and the susceptibility of milk fat globules to lipolysis have been described previously. A linear multiple regression model that included these two parameters in addition to the total amount of lipoprotein lipase could explain 80 to 87% of cold storage lipolysis. Analysis including only one parameter resulted in low and nonsignificant coefficients. This demonstrated that cold storage lipolysis is a complex problem and that the properties of the fat globules and the skin milk, in addition to the total activity of lipoprotein lipase, are important.