EN
The affinity between the volume of erythrocytes and the content of total water was studied in 12 calves, lowland black and white breed, aged 14—28 days. The examinations were performed on day 14, 21 and 28 of animals’ life. It was found a significant positive correlation between the total volume of erythrocytes and the content of total water. The indices of the correlation on days 14, 21, and 28 were + 0.955, +0.960, and +0.962. respectively. The data obtained point to the possibility to assess the volume of total water in the first months of calves’ life taking into consideration the total volume of erythrocytes.