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Journal of Dairy Science Vol. 51 No. 8 1207-1209
© 1968 by American Dairy Science Association ®
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Variation Within Herds in Composition of Herd Milk1

H. A. Morris, S. T. Coulter and C. E. Gates2

Department of Food Science and Industries, University of Minnesota, St. Paul

ABSTRACT

Within herd variation in composition among biweekly samples of milk during one year was determined by summarizing the data obtained from 88 herds representing the 2,536 herds supplying the Twin City Milk Producers Association. Arithmetic averages of the 88 Standard deviations and ranges in herd standard deviations by constituents follow: fat (average—0.224%, range—0.086-0.528%); solids-not-fat (average—0.147%, range—0.058-0.340); protein (average—0.181%, range—0.062-0.323%); casein (average—0.167%, range—0.056-0.290%). Haulers obtained samples from each farm herd in a routine way and the analytical work was routine. Thus, the variations reported include herd factors, influence of sampling, and analytical variations.

FOOTNOTES

1 Paper no. 6418, Scientific Journal Series, Minnesota Agricultural Experiment Station.

2 Current address: Institute of Statistics, Texas A & M University, College Station.






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Copyright © 1968 by the American Dairy Science Association ®.