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Department of Dairying, Oklahoma Agricultural Experiment Station, Stillwater, Oklahoma
ABSTRACT
Milk centralizing and distributing plants in Oklahoma are required by law to pasteurize all milk intended for retail trade. The purpose of this law is to insure that safe milk of low bacterial content, and of relatively high keeping quality be supplied to the ultimate consumer. However, sanitary conditions in the plant may be such that milk of good quality and low bacterial content may be pasteurized according to law, and yet may be so recontaminated before being placed in the bottles, that the purposes of the law are entirely defeated. The recontamination may arise from such equipment as the sanitary piping, pumps, filters, or coolers with which the milk may come into contact before being bottled. All of these pieces of equipment may appear sufficiently clean to the casual inspector, and still may be important sources of recontamination.
It has been known for years that steam or boiling water were very efficient as sterilizing agents.
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