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Journal of Dairy Science Vol. 69 No. 8 2219-2223
© 1986 by American Dairy Science Association ®
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Variation in Milk Fat, Protein, and Somatic Cell Count from Four Dairy Herd Improvement Laboratories1

D. T. Vines, B. F. Jenny, R. E. Wright and L. W. Grimes2

Department of Dairy Science, Clemson University, Clemson, SC 29634-0363

ABSTRACT

Information on variability in milk fat, protein, and somatic cell count among four Dairy Herd Improvement laboratories was studied. Approximately 395 individual cow samples from four herds were shipped in blind duplicate via common carrier to four Dairy Herd Improvement laboratories for analysis. One herd was sampled twice and one of the four laboratories was not equipped for protein determinations. As expected, samples differed among herds, laboratory, and interaction of herd by laboratory for the constituents analyzed. Reasons for the interactions could not be fully explained. However, delay in shipment of one set of herd samples to one laboratory probably contributed to the interaction for somatic cell count. Means from laboratories 1, 2, 3, and 4 across herds were 3.99, 3.90, 3.89, and 3.88 for percent fat, 3.45, 3.31, and 3.16 for percent protein and 364, 430, 322, and 380 for somatic cell count (x 1000). Variation among laboratories could not be explained by type of analytical instrument or time in shipment. These data indicate a need for use of uniform standards by testing laboratories to reduce variation in laboratory results.

FOOTNOTES

1 Technical Contribution Number 2468. Published with the approval of the Director, South Carolina Agricultural Experiment Station.

2 Department of Experimental Statistics, Clemson University.






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Copyright © 1986 by the American Dairy Science Association ®.