The objective of the present study was to evaluate the chemical composition and technological usefulness of cows milk kept in a certified organic farm. In the selected dairy farm, cows of two different breeds, i.e. (BS) and Holstein-Friesian (HF) between 45th–100th day of lactation, were managed under the same environment conditions. Results showed that in the summer and winter season milk yield, percentages of protein and fat, and also somatic cell score (SCC) were higher in milk of BS breed. However, protein to fat ratio, percentages of lactose and concentration of urea were higher in milk of HF breed. Only protein to fat ratio was higher in milk of BS breed during winter season. Milk from BS cows was characterized by a better usefulness of technological parameters, mainly lower coagulability time against the rennet and a higher of casein and beta-lactoglobulin content, which indicates that it is a better raw material for processors.