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    Farm management factors associated with bulk tank total bacterial count in Irish dairy herds during 2006/07

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    Author
    Kelly, P.T.
    O'Sullivan, Kathleen
    Berry, Donagh cc
    More, Simon J
    Meaney, William J
    O'Callaghan, Edmond J
    O'Brien, Bernadette
    Keyword
    Total bacterial count
    Milk
    Herd Management
    Date
    01/01/2009
    
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    URI
    http://hdl.handle.net/11019/276
    Citation
    PT Kelly , K O'Sullivan, DP Berry, SJ More, WJ Meaney, EJ O'Callaghan and B O'Brien. Farm management factors associated with bulk tank total bacterial count in Irish dairy herds during 2006/07. Irish Veterinary Journal, 2009, 62(1), 36-42. DOI: 10.1186/2046-0481-62-1-36
    Abstract
    Research has shown that total bacterial count (TBC), which is the bacterial growth per ml of milk over a fixed period of time, can be decreased by good hygiene and farm management practices. The objective of the current study was to quantify the associations between herd management factors and bulk tank TBC in Irish spring calving, grass-based dairy herds. The relationship between bulk tank TBC and farm management and infrastructure was examined using data from 400 randomly selected Irish dairy farms where the basal diet was grazed grass. Herd management factors associated with bulk tank TBC were identified using linear models with herd annual total bacterial score (i.e., arithmetic mean of the natural logarithm of bulk tank TBC) included as the dependent variable. All herd management factors were individually analysed in a separate regression model, that included an adjustment for geographical location of the farm. A multiple stepwise regression model was subsequently developed. Median bulk tank TBC for the sample herds was 18,483 cells/ml ranging from 10,441 to 130,458 cells/ml. Results from the multivariate analysis indicated that the following management practices were associated with low TBC; use of heated water in the milking parlour; participation in a milk recording scheme; and tail clipping of cows at a frequency greater than once per year. Increased level of hygiene of the parlour and cubicles were also associated with lower TBC. Herd management factors associated with bulk tank TBC in Irish grazing herds were generally in agreement with most previous studies from confinement systems of milk production.
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1186/2046-0481-62-1-36
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    Livestock Systems
    Teagasc publications in Biomed Central
    Teagasc publications in Biomed Central
    Food Chemistry & Technology
    Animal & Bioscience

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