Type

Journal Article

Authors

Bernadette O'Brien
Donagh P. Berry
Edmond J O'Callaghan
K. O'Sullivan
William J Meaney
Paddy T. Kelly
Simon J More

Subjects

Agriculture & Food Science

Topics
irish dairy total bacterial count infrastructure farm management bulk tank milk milk production dairy cattle linear models multivariate analysis dairy farm herd management management

Farm management factors associated with bulk tank total bacterial count in irish dairy herds during 2006/07 (2009)

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.
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Full list of authors on original publication

Bernadette O'Brien, Donagh P. Berry, Edmond J O'Callaghan, K. O'Sullivan, William J Meaney, Paddy T. Kelly, Simon J More

Experts in our system

1
Bernadette O'Brien
Teagasc
Total Publications: 48
 
2
D P Berry
Teagasc
Total Publications: 215
 
3
S J More
University College Dublin
Total Publications: 171