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Relationship between somatic cell count, polymorphonuclear leucocyte count and quality parameters in bovine bulk tank milk

Published online by Cambridge University Press:  13 March 2009

Erik Wickström ,
Karin Persson-Waller ,
Helena Lindmark-Månsson ,
Karin Östensson  and
Åse Sternesjö
Erik Wickström
Affiliation:
Department of Food Science, Swedish University of Agricultural Sciences, PO Box 7051, SE-750 07 Uppsala, Sweden
Karin Persson-Waller
Affiliation:
Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, SE-750 07 Uppsala, Sweden Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, SE-751 89 Uppsala, Sweden
Helena Lindmark-Månsson
Affiliation:
Swedish Dairy Association, Ideon Science Park, SE-223 70 Lund, Sweden
Karin Östensson
Affiliation:
Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, SE-750 07 Uppsala, Sweden
Åse Sternesjö*
Affiliation:
Department of Food Science, Swedish University of Agricultural Sciences, PO Box 7051, SE-750 07 Uppsala, Sweden
*
*For correspondence; e-mail: ase.sternesjo@lmv.slu.se
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Abstract

The somatic cell count (SCC) in bovine bulk tank milk is presently used as an indicator of raw milk quality, reflecting the udder health status of the herd. During mastitis, SCC increases, mostly owing to an influx of polymorphonuclear leucocytes (PMN) from blood into milk, with a concomitant change in milk composition. Bulk tank milk samples were categorized according to their SCC, as well as polymorphonuclear leucocyte count (PMNC), to study relationships between SCC, PMNC and various raw milk quality traits, i.e. contents of total protein, whey protein, casein, fat and lactose, casein number, proteolysis and rheological properties. The proportion of PMN, obtained by direct microscopy, was significantly higher in samples with high SCC compared with low SCC samples. SCC and PMNC were strongly correlated, yielding a correlation coefficient of 0·85. High SCC samples had lower lactose and casein contents, lower casein number and more proteolysis than low SCC samples. Samples with high PMNC had a lower casein number than low PMNC samples. Samples with high and low SCC or PMNC did not differ in respect to rheological properties. Our results do not indicate that PMNC is a better biomarker than SCC for raw bulk tank milk quality, as previously proposed.

Keywords

Neutrophilsmilk compositionbulk tank milk proteolysis
Type
Research Article
Information
Journal of Dairy Research , Volume 76 , Issue 2 , May 2009 , pp. 195 - 201
Copyright
Copyright © Proprietors of Journal of Dairy Research 2009

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