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The aim of this study was to determine the risk factors associated withhigh total bacterial count of bulk tank milk. Bulk tank milk sampleswere collected from all Prince Edward Island dairy herds (n=235)from March 2005 to March 2007. Biweekly total bacterial count wasconducted using a Petrifilm culture system. Data for on-farm riskfactors were collected via a mail-out survey which consisted of 4 mainsections: 1) general farm demographics and management, 2) cowcleanliness and hygiene, 3) milking procedures and mastitis control,and 4) equipment maintenance and cleaning.The total bacterial count was positively associated with the amount ofsoiling on the teats prior to udder preparation, manual cleaning of thebulk tank, and the use of a certain type of detergent. Additionally, variousmethods of premilking udder preparation were important, with predipfollowed by drying being superior to other methods in reducingbacterial count. Season was a strong predictor, with the lowest counttending to occur in winter. The results of this study highlight theimportance of total bacterial count as indicator of on-farm managementpractices, which influence bacteriological quality of milk.

HERD LEVEL RISK FACTORS FOR ELEVATED TOTAL BACTERIAL COUNT IN BULK TANK MILK OF DAIRY HERDS