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Accuracy of the Plastic Bead Method of Measuring Solids-not-fat of Milk Under Field Conditions^{1, 2,}

Departments of Dairy and Food Science, Michigan State University, East Lansing

ABSTRACT

The plastic bead method of measuring solids-not-fat (SNF) content of milk is a practical test for use by DHIA supervisors in the field. This method can be as accurate under field conditions as in the laboratory. The mean differences between duplicate readings in the field, between duplicates in the laboratory, and between duplicate readings in the field and the laboratory were .07, .14, and .16% SNF, respectively. Correlations between duplicate readings, between methods, and between field and laboratory were .86 or greater. Although the lactometer method appears slightly more accurate than the bead method, the difference is so small as to merit little consideration in practical use.

¹ Journal Article No. 2706 from Michigan Agricultural Experiment Station.

² These studies were supported in part by the Dairy Cattle Research Branch of the Agricultural Research Service, USDA.

³ Present address: Department of Dairy Industry, Utah State University, Logan, Utah.