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Investigation of Factors Contributing to the Bacterial Count of Bulk Tank Milk. II. Bacteria in Milk from Individual Cows¹

Statistical Research Service, Department of Agriculture Research Branch, Ottawa, Canada

H. Jackson

Department of Food Science, University of Alberta, Edmonton, Canada

C. H. McNaughton

Department of Food Science, University of Manitoba, Winnipeg, Canada

A. G. Leggatt

Department of Dairy Science, University ot Guelph, Guelph, Canada

G. B. Landerkin

Food Research Institute, Department of Agriculture Research Branch, Ottawa, Canada

C. K. Johns

Formerly Department of Agriculture Research Branch, Ottawa, Canada

ABSTRACT

Standard plate counts were made of milk from individual cows, using samples taken from the pails after machine-milking with University-sanitized equipment. All the healthy cows from each herd were included, giving a total of 27 herds drawn from three regions, with a total of 595 cows.

Within any herd of about 25 cows, the ratio of the lowest to the highest count was about 100. The mean counts at the 27 farms ranged from 690 to 15,500 colonies/ml, with a median value of 3,200. The bacterial count had a higher mean and greater variability than is sometimes assumed. Possible contributory causes include the procedures for washing and drying the udders, and the bacterial content of the milkhouse water supply.

¹ Food Research Institute Publieation no. 85.

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