The article presents the results of a study of the productive qualities of Holstein cows of the Dutch and German breeding, the presence of a correlative relationship between milk yield, the content and amount of milk fat, live weight, average daily milk yield and milk ratio. It is established the superiority of cows of Dutch breeding for milk yield for 305 days of lactation over cows of German breeding by 458 kg of milk (the third lactation), the difference is not significant. A comparative analysis of the results of studies of the productive qualities of cows of the first lactation of the Holstein breed of the Dutch and German breeding showed that the heifers - the descendants of the first generation exceeded their peer sin milk yield by 855 and 1444 kg of milk respectively, the difference is highly reliable (P<0.001). Low correlation coefficients between milk yield and live weight (positive - German breeding and descendants of the first generation) and (negative - Dutch breeding) indicate the non-linear nature of the relationships between them, and characterizes the uniformity of the herd of Joint-Stock Company „Aydyn” in live weight.