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Distribution of Bacteria in Milk Drawn Directly from the Cow's Udder

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

ABSTRACT

An experiment was conducted to determine the distribution of bacteria in aseptically drawn milk. The colony count was found to be highest in foremilk, but the addition of foremilk to the main milk made little difference to the count of the total milk because of the small volume of foremilk. The arithmetic mean colony count for four herds comprised of 97 cows was 3,403 bacteria/ml. Colony counts on total milk (foremilk + main milk) from individual cows showed a wide range of distribution: 16% having <100/ml, 56% <1000/ml, 97% <10,000/ml, and only 3% had counts greater than 10,000/ml.

A relationship between the colony count of the milk and the age of the cows was noted, cows in the first or second lactation showing appreciably lower counts in both foremilk and total milk than cows in the third or subsequent lactation.

¹ Present address: Poljoprivredni Fakulter, Novi Sad, Yugoslavia.