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A Survey of the Foss Pro-Milk Mk II Tester in Use in Australia

Authors: T. Clarke and J.A. Stewart


A survey of the Foss Pro-Milk Mk II tester in use in Australia was made to collect and share information about operator experience with this protein-testing apparatus. In addition, a uniform check sample was used to measure the variation between the calibration of fifteen instruments. Results indicated that there were substantial variations between laboratories (SD 0.13 at 3.66% protein level). Differences in milk-to-dye ratios and in methods of estimating protein from Kjeldahl nitrogen explained some but not all of the variations between laboratories. Variations between determinations using the same instrument were negligible.

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