Origins and levels of post pasteurization contamination of milk in the dairy and their effects on keeping quality.
Bacterial post pasteurization contamination with psychrotrophic Gram-negative rods (GNR) was measured in commercial milks before and after transfer to retail containers. The tanks of pasteurized milk feeding the filling units contaminated milk less often (39% of samples) but usually at a higher level than the filling units (92% of samples). The number of GNR present had a considerable influence on the shelf life of milk, and the range found in commercially pasteurized milk was reflected in a wide range of shelf lives.
D000818:Animals; D001419:Bacteria / Q000302:isolation & purification; D002417:Cattle; D003612:Dairying; D005506:Food Contamination / Q000032:analysis*; D005511:Food Handling / Q000379:methods*; D005516:Food Microbiology; D006358:Hot Temperature; D008892:Milk / Q000382:microbiology*