A Study of Thermal Resistance of Micrococci in Milk

Abstract
Fifty-one cultures of micrococci, some isolated from raw milk drawn aseptically from cows and some from laboratory pasteurized raw milk, were studied to determine their thermal death times at 143[degree]F; also, thermal death time curves were established for certain selected cultures. The z values of thermal death time curves ranged from 13.0 to 18.2. Results indicated that the cow''s udder is not a common source of thermoduric micrococci.