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A Method of Awarding Marks for Uniformity of Low Bacterial Count in Clean Milk Competitions

in Agricultural Botany and Bacteriology, The University, Leeds, England

ABSTRACT

In "Clean Milk Competitions" in England the cleanliness of a sample of milk is judged on three points, namely (1) the total number of organisms per cubic centimeter which grow on a standard nutrient agar, (2) the degree of infection by coliform organisms, as shown by the presumptive test and (3) the number of days which the milk remains sweet after milking when kept at a temperature of 60°F. Marks are awarded for the above points according to the scale suggested in the "Guide to the Conduct of Clean Milk Competitions (1926)" published by the Ministry of Agriculture. The competitions generally run for a period of six months, milk samples being taken at fortnightly intervals. The total number of marks awarded to a competitor under the three headings is in general taken to be an index of his ability to produce clean milk.

In this system of marking it will be noted that no account is taken of the consistency of cleanliness of successive examples of any one competitor.