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A Comparison of the Babcock and the Roese-Gottlieb (Mojonnier) Methods for Determination of Butterfat in Milk

Dairy Industry Division, University of California, Davis, California

ABSTRACT

The Babcock test for butterfat in milk has been used with but few changes since its discovery in 1890. During the period of over thirty years, however, several investigators have made comparisons as to its accuracy.

A very complete summary of the work from 1890 to 1916 was prepared by Bailey (11).

A few other investigations had been made up to this time but the results were not altogether complete.

Julius Hortvet (12) in 1917 reported that the average of the results of ten different men showed that the Babcock test gave a reading of 0.04 per cent lower than the Roese-Gottlieb method.

Work carried out by Bailey (11) in 1916–1918 on 190 samples, showed fairly uniform results.

Mojonnier and Troy (13) in 1922 reported some comparative work in which there was a rather wide variation in the results between the Babcock and Roese-Gottlieb (Mojonnier) methods.

Hoyt (14) and Dahlberg (15) presented reports to the California Creamery Operators Assn. at the Pacific Slope Dairy Products Show, Fresno, Calif., November 1922, showing that the average Babcock reading was considerably higher than the Roese-Gottlieb (Mojonnier) results.