The assessment of the respiratory function of blood and its interaction with cortisol in pregnancy of cows

There wasstudied the state of the respiratory function of blood of cows in the last trimester of pregnancy and interaction of its indicators with the level of cortisol. The object of the research was the cows of black-and-white and Auliekol breeds, preparing for the second calving, the breeding of which was provided by free mating with the stud bulls of the Aberdeen-Angus breed. The research material was blood, which was obtained 60 and 1-3 days before the expected delivery. It was established that the breed of the cows does not affect the dynamics of hematological indicators. By the time of delivery, the number of red blood cells (6.28-10.36%) and their volume (2.532.29%), hemoglobin (9.24-9.85%, p