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Daily News

28.06.10

No correlation between bulk milk SCC and clinical mastitis incidence

The objective of this study was to evaluate the association of pathogen-specific incidene rate of Clinical Mastitis (IRCM) with bulk milk somatic cell count (BMSCC). In total, 106 dairy farms in 10 provinces of Canada participated in the study for a period of 1 yr. The most frequently isolated mastitis pathogens were Staphylococcus aureus, Escherichia coli, Streptococcus uberis, and coagulase-negative staphylococci. Overall mean and median IRCM were 23.0 and 16.7 cases per 100 cow-years in the selected herds, respectively, with a range from 0.7 to 97.4 per herd. No association between BMSCC and overall IRCM was found, but E. coli and culture-negative IRCM were highest and Staph. aureus IRCM was lowest in low and medium BMSCC herds. Cows in tie-stalls had higher incidences of Staph. aureus, Strep. uberis, coagulase-negative staphylococci, and other streptococcal IRCM compared with those in free-stalls, whereas cows in free stalls had higher Klebsiella spp. and E. coli IRCM than those in tie-stall barns. The focus of mastitis prevention and control programs should be tailored to farms based on housing type and BMSCC.

References

Olde Riekerink RG, Barkema HW, Kelton DF, Scholl DT. Incidence rate of clinical mastitis on Canadian dairy farms. J Dairy Sci. Apr;91(4):1366-77, 2008