The article presents the results of studying the variability and correla-tion of the main features of milk production at Holstein cows. The studies were carried out in the herds of Joint-Stock Company "Aydyn" " (Dutch and German breed), of Society Limited Liability "Total Gnatyuk" (German and French breed), of Society Limited Liability "Doksancom" and Society Limited Liability "Heximsud" - Dutch breeding. The aim of the research was to study the variability and identify the correlations of the main economically useful traits of Holstein cows of different genetic origin. A positive correlation was found in terms of milk yield and fat content in milk of cows for the third lactation (+0.925, Dutch breed), moderate (+0.349, German breed) in the herd of the breeding farm Joint-Stock Company "Aydyn", which indicates the success of choice or simultaneous selection between these traits. In the of Society Limited Liability SRL herd "Total Gnatyuk," the first-calves of French selection by yield for 305 days of lactation exceeded the first-calves of German selection by 784 kg of milk, the difference is highly reliable (P < 0.001).