Abstract
Abstract The Milko-Tester Minor was tested to determine if it conformed to recommended AOAC performance specifications. Results were compared with those from the Babcock method and other approved instruments. Results indicated that the MT Minor conformed to the specifications for transfer errors, linear response, and homogenizer efficiency. In addition, 3 MT Minors, 1 Milko-Tester Automatic, 2 Model 300 Milk-Scans, and the Babcock method were used to determine 15 individual cow milks and 15 bulk milks in triplicate. Standard deviations of triplicates were 0.035 and 0.024 (av. for MT Minors), 0.015 and 0.013 (Automatic), 0.030 and 0.012 (av. for Milko-Scans), and 0.039 and 0.038% (Babcock) for individual and bulk milks, respectively. Standard deviations of differences between instrument and Babcock results were within recommended limits with the 3 MT Minors, averaging 0.070 and 0.042% on individual and bulk milks, respectively. Analysts and MT Minors instrumental variations were studied by having 3 analysts operate each of 3 MT Minors independently to test 12 samples. Range of average fat content was 4.290–4.312% for analysts and 4.292–4.311% for instruments.
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