On the other hand, during the milk cooling, psychrotrophic
bacteria are able to produce thermostable lipolytic and
proteolytic enzymes, causing bad taste in cheese (bitter
taste, and unwanted off-flavors.) (Le jaouen, 1993). These
micro-organisms present in raw milk, have the ability to
grow at low temperature (4-8°C). Among the incriminated
flora is the genus Pseudomonas, especially the species
Pseudomonas fluorescens (Law and Haandrikman, 1997).