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Journal of Dairy Science Vol. 72 No. 7 1713-1718
© 1989 by American Dairy Science Association ®
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Environmental Factors Affecting Plasmin Activity in Milk

I. Politis and K. F. Ng Kwai Hang

Department of Animal Science, Macdonald College of McGill University, 21,111 Lakeshore Road, Ste Anne de Bellevue, Quebec, Canada H9X 1C0

R. N. Giroux

Agropur Coopérative Agro-Alimentaire, Granby, Quebec, Canada J2G 7G2

ABSTRACT

A total of 367 milk samples were collected from 43 individual Holstein cows during 1 yr. Samples were analyzed for plasmin activity, total casein, {alpha}s-casein ({alpha}s1-casein + {alpha}s2-casein), ß-casein, {kappa}-casein, and SCC. Least squares analyses showed that SCC in milk were positively related (r = .62) to plasmin activity. An increase of SCC from 100,000 to 1,300,000/ml was associated with a 2.3-fold increase in plasmin activity (100 vs. 230 x 10-6 units/ml). Increased plasmin activity was associated with advancing stage of lactation and older cows after appropriate adjustments were made for the effects of milk yield and SCC. Milk samples obtained in fall and winter were higher, but not significantly, in plasmin activity. Plasmin activity was also associated with major casein components and milk pH. Correlations coefficients between plasmin and {alpha}s-casein, ß-casein, and pH were –.14, –.27, and .19.




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G. Theodorou, A. Kominakis, E. Rogdakis, and I. Politis
Factors Affecting the Plasmin-Plasminogen System in Milk Obtained from Three Greek Dairy Sheep Breeds with Major Differences in Milk Production Capacity
J Dairy Sci, July 1, 2007; 90(7): 3263 - 3269.
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Copyright © 1989 by the American Dairy Science Association ®.