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    • IJAFR, volume 52, no 2, 2013
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    • Irish Journal of Agricultural & Food Research
    • IJAFR, volume 52, no 2, 2013
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    Farm management factors associated with the Bacillus cereus count in bulk tank milk

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    Author
    O'Connell, Aine
    Ruegg, P.L.
    Gleeson, David E
    Keyword
    Bacillus cereus
    Farm factors
    Milk quality
    Thermoduric bacteria
    Date
    2013
    
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    URI
    http://hdl.handle.net/11019/531
    Citation
    A. O’Connell, P.L. Ruegg and D. Gleeson. 2013. Farm management factors associated with the Bacillus cereus count in bulk tank milk. Irish Journal of Agricultural and Food Research 52: 229–241
    Abstract
    The objective of this study was to determine the on-farm management factors that are associated with the Bacillus cereus count in raw bulk tank milk using a cross sectional study design. Bulk tank milk quality was monitored for B. cereus on 63 dairy farms between July and August 2012. Bulk tank milk samples corresponding with processor milk collection dates were taken over a two week period prior to the farm visit and tested for B. cereus. The four most recent samples taken prior to the on-farm visit were averaged and log transformed to give the outcome variable; mean log10 B. cereus cfu/mL. On-farm data collection included recording observations and providing a questionnaire on basic hygiene, management factors and cow hygiene scoring. All independent variables were analysed individually with the outcome variable using simple linear regression and one-way ANOVA; a multivariable regression model was subsequently developed. Only significant variables were retained in the final model (P < 0.05). The geometric mean B. cereus count for all milk samples was 40 cfu/mL. The start temperature of the cleaning solution wash, dry wiping teats prior to unit application, the feeding of silage and reusing the cleaning solution more than once were all unconditionally associated (P < 0.10) with the B. cereus count in bulk tank milk but did not enter the final multivariable model. B. cereus count was four times greater (201 cfu/mL) when cows had been housed compared to when they were on pasture (50 cfu/mL). The allocation of fresh grass every 12 h (62 cfu/mL) resulted in a decrease in B. cereus count (166cfu/mL every 24 h or greater). The testing of water for bacteriology was associated with an increase in B. cereus count. In conclusion, this study highlights specific management factors associated with the B. cereus count in bulk tank milk.
    Funder
    Teagasc Walsh Fellowship Programme
    Collections
    Livestock Systems
    Livestock Systems
    IJAFR, volume 52, no 2, 2013

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