QUALITY CONTROL OF MILK PRODUCTION BY MEANS OF THE CYTOCHROME OXIDASE TEST

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Abstract
The test for determination of organisms which are oxidase-positive applied to raw milk samples is an effective means for indication of proper cleaning and sanitary procedures on the farm. The total and oxidase-positive counts of raw milk samples from many producers were determined over a 3 month period in order to obtain a basis for minimum standards. The ratio of the total count to the oxidase count, as well as the total numbers of oxidase-positive organisms in the sample, were used to decide if a potential bacterial problem on the farm would develop. Case histories of individual producers are cited to illustrate how to interpret data obtained with the test and to show how use of the data helps to produce milk of good quality. The number of oxidase-positive organisms in laboratory pasteurized samples was also determined and generally found to be low indicating that most, but not all, of such organisms are killed by proper heat treatment.

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