Minn. Stat. § 32D.21: COOLING AFTER PASTEURIZATION.

Immediately following pasteurization, all milk and fluid milk products shall be cooled in properly operated equipment approved by the commissioner to a temperature of 45 degrees Fahrenheit or lower, and maintained at 45 degrees Fahrenheit or lower until delivered; provided, however, that if the milk or fluid milk product is to be cultured immediately after pasteurization, then cooling may be delayed until after the culturing process is completed; provided further that the commissioner may prescribe by rule standards more stringent than those imposed by this section.