Milk is considered to be food-medicine and mythological subject which nowadays has a lot of praise, as it had in the past, praise, brought not only by ordinary people but also by scientists, doctors, pharmacists, zootechnicians, etc. This paper was prepared for a study on the quality of cow raw milk in northern Romania. The study was based on the influence of age, lactation period and the diet of cattle on some qualitative components of raw milk coming from the households. The physico-chemical properties determined were density, dry substance, acidity, fat and lactose. Standardized tools and methods were used. There were noticed significant variations of qualitative characteristics of raw milk in winter. It was obtained a very significantly positive correlation between dry substance and fat content, r = 0.899***. Also, lactose is significantly positively correlated with the fat content, r = 0.628** but also with the dry substance content, r = 0.564*. The age and the lactation period don’t influence the variation of the physical and chemical constituents.
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