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. 2003 Jan;67(1):60-3.

Evaluation of the reliability and repeatability of automated milk urea nitrogen testing

P Arunvipas  1 , J A VanLeeuwen, I R Dohoo, G P Keefe
Affiliations

Evaluation of the reliability and repeatability of automated milk urea nitrogen testing

P Arunvipas et al. Can J Vet Res. 2003 Jan.

Abstract

The purpose of this study was to evaluate the reliability (precision and accuracy), and repeatability of an infrared method of determining milk urea nitrogen. The reference method used for the reliability assessment was a wet-chemistry, enzymatic determination of milk urea nitrogen. Reliability and repeatability, as measured by concordance correlation coefficients, were 0.97 and 0.99, respectively.

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Figures

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Figure 1. Scatter plot of milk urea nitrogen (MUN) results from the enzymatic method (CL10) and infrared method (FOSS4000).
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Figure 2. Difference between the milk urea nitrogen (MUN) concentrations from the enzymatic and infrared methods plotted against the mean value from the 2 methods, with horizontal lines showing the 95% limits of agreement.
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References

    1. Godden SM, Lissemore KD, Kelton DF, Lumsden JH, Leslie KE, Walton JS. Analytic validation of an infrared milk urea assay and effects of sample acquisition factors on milk urea results. J Dairy Sci 2000;83:435–442. - PubMed
    1. Gustaffson AH. Current status concerning the use of milk urea concentration: analytical methods, use in different countries and how to utilize the results. Proceeding of the 30th Biennial Session of ICRA, Velhoven, The Netherlands, 1996:223–228.
    1. Grappin R, Packard VS, Ginn RE. Repeatability and accuracy of dye-binding and infrared methods for analyzing protein and other milk components. J Food Prot 1980;43:374–375. - PubMed
    1. Gustafsson AH, Carlsson J. Effects of silage quality, protein evaluation systems and milk urea content on milk yield and reproduction in dairy cows. Livest Prod Sci 1993;37:91–105.
    1. Lin Li-K. A concordance correlation coefficient to evaluate reproducibility. Biometrics 1989;45:255–268. - PubMed

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