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Journal of Dairy Science Vol. 14 No. 2 93-106
© 1931 by American Dairy Science Association ®
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A Test for the Detection of Milk Unstable to Heat

Guy A. Ramsdell, WM. T. Johnson, Jr. and Fred R. Evans

Bureau of Dairy Industry, U. S. Department of Agriculture

ABSTRACT

  1. A test has been developed for the detection of milk unstable to heat. The test is rapid and made applicable to factory routine.
  2. Milk that coagulates in the test is invariably of low heat resistance. Composites of this class of milk are also of low heat stability.
  3. In grading milk on the basis of the phosphate test, the elimination of the phosphate positive milk often results in obtaining a milk of higher stability towards heat.
  4. Phosphate number is defined.
  5. Relation between phosphate number and coagulation time is shown.
  6. There is no apparent relationship between pH and phosphate number.
  7. Single herds are reasonably constant in their phosphate number.
  8. This test has been tried on a commercial scale in a condensery in California.






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Copyright © 1931 by the American Dairy Science Association ®.