Adaptive reactions of cows, depending on their functional state, physiological and technological loads

The state of cows’ adaptation was investigated under several physiological loads, such as: pregnancy, lactation, time after calving, at rest and under technological loads. Adaptive reactions were assessed by the degree of activity of the sympathoadrenal system (SAS), by the state of the nervous and cardiovascular systems of cows. The following were identified: secretory function, the amount and change in the concentration level of catecholamines, as well as the electrical activity of the skin; studies of the cardiovascular system were carried out by electrocardiography. An increase in the stress of the physiological regulation of the body of the female was revealed as it approached the next calving. Using selected gradations of sympathoadrenal system activation, periods of tension and their connection with the physiological state of animals were identified. It has been established that while maintaining the physiological optimum, only a part of the animals has the ability for long-term, stable productivity without depleting the body’s reserves...