In a field study covering 15–16 months and which involved 155 Grade A milk producers in three widely separated areas, a detergent-sanitizer was compared with customary methods of milk utensil sanitization. No supervision was made of the producers other than that normally given by the sanitarian and fieldman. Bacterial counts, thermoduric and total, tended to be lower in the milk from producers using the detergent-sanitizer sanitization procedure. Milking utensils appeared cleaner and, milk-stone deposits were absent from the utensils of those producers who used the detergent-sanitizer method. Since this study covered an extended period of time with only normal supervision of the producers, the detergent-sanitizer method appears to be one that can be used routinely over an indefinite period of time with entirely satisfactory results.

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Author notes

1Presented at the annual meeting of the International Association of Milk and Food Sanitarians, Seattle, Washington, September 5–7, 1956.

2Published with the approval of the Director of Research, North Carolina Agricultural Experiment Station, Raleigh, as paper No. 756 of the Journal Series.

Marvin L. Speck was educated at the University of Maryland and Cornell University. He was bacteriologist at Western Maryland Dairy, Baltimore 1935–36; instructor in bacteriology at the University of Maryland, 1940–41; and assistant chief bacteriologist with National Dairy Research Laboratories, 1941–47. He also has held temporary appointments as bacteriologist in the Dairy Research Laboratories, U. S.D. A., 1936, and with the Dairymen's League, Poughkeepsie, N. Y., in 1940. His present position is Professor of Dairy Bacteriology, Department of Animal Industry, N. Carolina State College, Raleigh, N. Carolina.