Bulk tank milk somatic cell count and sources of raw milk contamination with mastitis pathogens
Rysanek, D.,Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (Czech Republic) | Babak, V.,Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (Czech Republic) | Zouharova, M.,Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (Czech Republic)
The objective of this study was to probe the relationship between prevalence of selected principal mastitis pathogens (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus uberis) and somatic cell counts (SCC) in bulk tank milk samples and to evaluate the sources of milk contamination. Only 48.3% of the bulk tank milk samples collected from 298 dairy herds were free of contamination. Approximately 38.9% of the milk samples were contaminated with one, 12.4% with two and 0.3% with three pathogens. The arithmetic mean of logarithmically transformed data of SCC increased in the following order: pathogen free, Pseudomonas aeruginosa, Streptococcus uberis, Escherichia coli and Staphylococcus aureus (5.381; 5.413; 5.495; 5.518; 5.563, respectively). The arithmetic mean differences between SCC in pathogen-free and single-pathogen contaminated samples revealed a significance for the Escherichia coli and Staphylococcus aureus groups. Using binary logistic regression, a statistically highly significant relationship was found between the number of contaminations and SCC. High levels of pathogens along with a low SCC may suggest an environmental source of contamination.
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