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Comparison of the Accuracy of the USDA Lactometer Method with the Mojonnier Method for Determining Total Solids of Milk¹

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

ABSTRACT

The accuracy of the USDA lactometer method (2) in determining total solids of milk has been compared with the Mojonnier method (1) in conjunction with a study on the composition of milk in relation to milk pricing.

A total of 2,076 herd samples of milk, each representative of one day's production, taken biweekly, was obtained from 80 patrons of the Twin City Milk Producers Association over a 1-yr period. Some 2,536 herds were divided into 16 strata on the basis of initial fat tests; five herds were randomly selected from each of the strata to ensure samples from the full range. At time of selection, fat tests ranged from 3.0 to 6.3%.

A graphical presentation of total solids by Mojonnier (Y) vs. lactometer (X) is shown in Figure 1, with corresponding computer-generated statistics in Table 1. The excellent agreement between the two methods can be seen from the graph and from the correlation coefficient of 0.989.

¹ Paper no. 6079, Scientific Journal Series, Minnesota Agricultural Experiment Station.

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