Microbiological quality of bulk tank raw milk in ...

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Title Microbiological quality of bulk tank raw milk in Prince Edward Island dairy herds
Author(s) A. M. Elmoslemany, G. P. Keefe, I. R. Dohoo, R. T. Dingwell
Journal Journal of Dairy Science
Date 2009
Volume 92
Issue 9
Start page 4239
End page 4248
Abstract The objectives of this study were to evaluate microbiological quality of bulk tank milk in Prince Edward Island, to evaluate correlation among milk quality criteria, and to determine seasonal effects on milk quality parameters. Bulk tank raw milk quality was evaluated on all Prince Edward Island dairy herds (n=235) over a 2-yr period (March 2005 to March 2007). Biweekly total aerobic (TAC), preliminary incubation (PIC), laboratory pasteurization, and coliform (CC) counts were determined using a Petrifilm culture system. Additionally, bulk tank somatic cell count was determined weekly. The mean and median values were 12.8×103 and 4.9×103 cfu/mL for TAC, 29.6×103 and 13×103 cfu/mL for PIC, 87 and 12 cfu/mL for laboratory pasteurization count, 21 and 5 cfu/mL for CC, and 218×103 and 187×103 cells/mL for somatic cell count. There was moderate correlation (0.57) between TAC and PIC. All other correlation coefficients were low (<0.26). Correlation results suggest that a single quality parameter could not predict others used in this study. Seasonal data indicate that (1) in general, all counts tended to be low in winter, (2) the CC and somatic cell count were always high in summer, and (3) TAC tended to be high during summer.

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