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Investigations on the use of the Milko-tester for routine estimation of fat content in milk

Published online by Cambridge University Press:  01 June 2009

M. F. Murphy  and
T. C. A. McGann
M. F. Murphy
Affiliation:
The Agricultural Institute, Fermoy, Co. Cork, Ireland
T. C. A. McGann
Affiliation:
The Agricultural Institute, Fermoy, Co. Cork, Ireland
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Summary

Results of studies on the operation of the Milko-tester Mark II for the estimation of fat in both herd and individual milks are presented. Milko-tester readings were compared to the means of duplicate Gerber results.

It was found that, for 894 herd milks, a direct Milko-tester reading (G = M) had a standard error of estimate of ±0·071, whereas regression equation (G = 1·02 M −0·075) derived for the same data gave ±0·070. For 1133 individual milks, the equation (G = 1·03 M − 0·186) also had an accuracy of ±0·070, while the direct Milko-tester reading gave ±0·107. However, a simple subtraction of 0·077 from each Milko-tester value (i.e. G = M−0·077) for individual milks reduced the standard error to ±0·071.

It is concluded that the Milko-tester is satisfactory for herd milks, particularly for milks up to 3.8 % fat. For individual milks a special regression relationship is necessary to achieve comparable accuracy.

Type
Original Articles
Information
Journal of Dairy Research , Volume 34 , Issue 1 , February 1967 , pp. 65 - 72
Copyright
Copyright © Proprietors of Journal of Dairy Research 1967

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References

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