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Lipoprotein Lipase Activity of Milk from Cows with Prolonged Subclinical Mastitis

Department of Food Science, The Pennsylvania State University, University Park 16802

ABSTRACT

The influence of prolonged subclinical mastitis on bovine milk lipoprotein lipase activity was investigated. Nine cows with at least one quarter with prolonged subclinical mastitis and at least one nonmastitic quarter were selected in various stages of lactation. Milk from subclinical quarters had a mean somatic cell count of 5.7 x 10⁶ cells/ml while milk from nonmastitic quarters had an average somatic cell count of 9.4 x 10⁴ cells/ml. Quarters with a subclinical infection contained the same pathogenic organisms for a minimum of 6 wk. The average milk lipoprotein lipase activity of 108.7 units/ml milk from subclinical quarters was 27.1% higher than the average enzyme activity of 79.2 units/ml milk from nonmastitic quarters. Conditions present in the mammary gland during prolonged subclinical mastitis could lead to increased milk lipoprotein lipase activity in raw milk.

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