The aim of the research was to determine the efficiency of using sire bulls of various origins in the process of reproduction of dairy cattle. The indices of economically useful traits of the studied animals were analyzed according to the data of the primary zootechnical registration according to the generally accepted methods of biometric analysis. The productivity of daughters cows was assessed by the quantitative and qualitative indicators of the composition of milk obtained in 305 days of the first, second, third lactation according to generally accepted methods. The influence of the ecological-geographical origin of the bull-producer on the main economic characteristics of animals of dairy breeds has been established. Among first-calf heifers, the maximum productivity was obtained from the daughters of American-bred bulls - 5919 ± 100.2 kg. A comprehensive analysis of the main components of the milk of Holstein cows obtained from producers of American, Canadian, German origin suggests that it is suitable mainly for the manufacture of drinking milk and fermented milk products and less suitable for the manufacture of high quality hard cheeses.