•  
  •  
 

Bulletin

Abstract

The pasteurized milk coming from certain of the Iowa market milk plants contains larger numbers of bacteria than would be expected from the numbers present in the raw milk. These large numbers are sometimes due to contamination following pasteurization, but comparatively high counts are also encountered with carefully pasteurized milk taken directly from the pasteurizer so that there is no opportunity for contamination from the cooler, bottler, etc.

In order to determine whether or not certain milk supplies contain comparatively large percentages of heat resistant organisms, the pasteurization efficiencies1 secured with milk coming from different farms were studied. The trials were conducted on milk coming to two small Iowa market milk plants. Most of the samples examined were morning milk delivered to the plants shortly after production; these were selected so that the results would apply primarily to organisms getting into the milk from various sources rather than to those that had grown in the milk.

Share

COinS
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.