The article is concerned with data obtained as result of studies on the axial skeleton of young Red Steppe cattle. To study the dynamics of age changes occurring in the components of the axial section of skeleton two groups of steers and one group of heifers at the age of 6, 12 and 18 months were selected and kept under the conditions of intensive rearing and fattening. It was established that both the absolute and relative skeleton mass are being changed with age. To determine the age changes in the components of the skeleton axial section the ratio of their mass to skeleton parts and the before slaughter live weight were analyzed in details. The data obtained indicate that in young animals of all the groups under study the mass of the vertebral column, ribs and thoracic extremities as related to live weight before slaughter were gradually reducing. At the same time at the age of 18 months there was observed an increase of specific weight of ribs and thoracic extremities. Eventually, it is stated that there exists direct relationship between the dynamics of skeleton parts mass and changes in the size and shape of bones which greatly influence the formation of cattle body structure in different age periods.