The purpose of the present researches, established in conditions of great productivity, is to create influence of the cooling devices over the microbiological qulity of milk submited to the cooling quantified through NTG. The results obtained point out the aspect that the technique-functional performances and the hygine state belonging to the studied cooling devices (of the same tipe) influence the microbiological quality of milk, the sens and the size of the influence is very diferent according to the cooling used practicaly.