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Related Experiment Videos

Environmental factors affecting plasmin activity in milk.

I Politis1, K F Ng Kwai Hang, R N Giroux

  • 1Department of Animal Science, Macdonald College, McGill University, Quebec, Canada.

Journal of Dairy Science
|July 1, 1989
PubMed
Summary

Somatic cell count (SCC) in Holstein cow milk is positively linked to plasmin activity, increasing significantly with higher SCC. Factors like lactation stage and cow age also influence plasmin levels.

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Area of Science:

  • Dairy Science
  • Animal Biochemistry

Background:

  • Plasmin plays a role in milk quality and cheese making.
  • Somatic cell count (SCC) is an indicator of udder health in dairy cows.
  • Understanding factors affecting plasmin activity is crucial for dairy production.

Purpose of the Study:

  • To investigate the relationship between somatic cell count (SCC) and plasmin activity in Holstein cow milk.
  • To explore other factors influencing plasmin activity, including lactation stage, cow age, and casein composition.

Main Methods:

  • Collected 367 milk samples from 43 Holstein cows over one year.
  • Analyzed milk for plasmin activity, total casein, alpha s1-casein, alpha s2-casein, beta-casein, kappa-casein, and SCC.
  • Utilized least squares analyses to determine relationships between variables.

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Main Results:

  • A significant positive correlation (r = .62) was found between SCC and plasmin activity.
  • Increased SCC from 100,000 to 1,300,000 cells/ml corresponded to a 2.3-fold rise in plasmin activity.
  • Plasmin activity was also associated with advanced lactation stage, older cows, and showed correlations with casein components and milk pH.

Conclusions:

  • Elevated SCC in milk is a strong indicator of increased plasmin activity.
  • Lactation stage and cow age are additional significant factors affecting plasmin activity.
  • Findings provide insights into milk enzyme activity relevant to dairy processing and quality.