Influence of Mastitis on Properties of Milk. IV. Hydrolytic Rancidity

Abstract

The effect of mastitis on acid degree values and lipase activity of milk was investigated using quarter milk samples obtained from individual cows. Both acid degree values and lipase activity were significantly higher (P<0.01) in the Wisconsin Mastitis positive (>20 mm) samples than in the corresponding negative samples (<10 mm). Initial acid degree values for the mastitis positive (>20 mm) samples were 35 to 40% higher than for the negative samples. This relationship was also observed when lipolysis was spontaneous or induced. Lipase activity of the positive samples was approximately 7% higher than for the negative samples. © 1969, American Dairy Science Association. All rights reserved.