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Gradient Balance Method for Specific Gravity Determination in Milk¹

Department of Dairy Science, The University of Arizona, Tucson

ABSTRACT

The accuracy of the immiscible gradient balance method for determining the specific gravity and solids-not-fat (SNF) of milk was compared with the Watson lactometer and gravimetric procedures. Observations were also made to verify the effect of the breed of animal, stage of lactation, use of chemical preservatives, and effect of sample heat-tempering upon the accuracy of the method. The gradient balance method gave results slightly lower than those obtained with the Watson and gravimetric procedures. Results from the method gave greatest variation from the Watson technique in milk produced by the Jersey breed or in late lactation. Formalin preservative or prior heat-tempering of the sample did not affect the results.

¹ Arizona Agricultural Experiment Station, Technical Paper no. 972.

² Present address: Ministry of Agriculture, Omdurman, Sudan.