Wickström, Erik
- Department of Molecular Sciences, Swedish University of Agricultural Sciences
Research article2009Peer reviewed
Relationship between somatic cell count, polymorphonuclear leucocyte count and quality parameters in bovine bulk tank milk
Wickström, Erik; Persson Waller, Karin; Lindmark-Månsson, Helena; Östensson, Karin; Sternesjö, Åse; Lundh, Åse; Sternesjö Lundh, Åse; Östensson, Karin; Lindmark-Månsson, Helena
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
Neutrophils; milk composition; bulk tank milk proteolysis
Published in
Journal of Dairy Research
2009, volume: 76, number: 2, pages: 195-201
Publisher: CAMBRIDGE UNIV PRESS
SLU Authors
Persson Waller, Karin
- Department of Clinical Sciences, Swedish University of Agricultural Sciences
- National Veterinary Institute (SVA)
- Department of Clinical Sciences, Swedish University of Agricultural Sciences
Östensson, Karin
- Department of Clinical Sciences, Swedish University of Agricultural Sciences
- Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences
- Department of Clinical Sciences, Swedish University of Agricultural Sciences
Lundh, Åse
- Department of Molecular Sciences, Swedish University of Agricultural Sciences
- Department of Molecular Sciences, Swedish University of Agricultural Sciences
UKÄ Subject classification
Food Science
Animal and Dairy Science
Veterinary Science
Publication identifier
- DOI: https://doi.org/10.1017/S0022029909003926
Permanent link to this page (URI)
https://res.slu.se/id/publ/61289