Monitoring of pasteurization systems

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Pasteurize waste cows milk and colostrum
CalfStart understands the value of your
replacements and strives to assist you
optimizing their productivity through
monitoring, education and consultation in
the management of newborn calf nutrition
using whole pasteurized milk and colostrum systems.


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Leslie C. Altic,1 Michael T. Rowe,2 and Irene R. Grant1*

 

Institute of Agri-Food and Land Use, School of Biological Sciences, Queen’s University Belfast,1 and Agri-Food and Biosciences Institute for Northern Ireland,2 Belfast, Northern Ireland, United Kingdom

 Received 10 January 2007/Accepted 4 April 2007

 

    UV light inactivation of Mycobacterium avium subsp. paratuberculosis in Middlebrook 7H9 broth and whole and semiskim milk was investigated using a laboratory-scale UV machine that incorporated static mixers within UV-penetrable pipes. UV treatment proved to be less effective in killing M. avium subsp. paratuberculosis suspended in milk (0.5- to 1.0-log10 reduction per 1,000 mJ/ml) than that suspended in Middlebrook 7H9 broth (2.5- to 3.3-log10 reduction per 1,000 mJ/ml). The FASTPlaqueTB phage assay provided more rapid enumeration of surviving M. avium subsp. paratuberculosis (within 24 h) than culture on Herrold’s egg yolk medium (6 to 8 weeks). Despite the fact that plaque counts were consistently 1 to 2 log10 lower than colony counts throughout the study, UV inactivation rates for M. avium subsp. paratuberculosis derived using the phage assay and culture results were not significantly different (P  0.077).

 

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