1. At least once every thirty days an estimate of the bacterial quality shall be made of each producer’s milk by use of a standard plate count or an equivalent plate counting procedure in an officially designated laboratory.
2. For the purpose of quality improvement and payment, the following classifications of milk for bacterial estimate are applicable:
Bacterial Estimate Standard Plate Count
Classification or Equivalent
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Class 1 Not over 100,000 per Milliliter
Class 2 Not over 300,000 per Milliliter
Undergrade Over 300,000 per Milliliter