Adaptive changes in immunological, hematological and metabolic profiles of pregnant cows

Pregnancy triggers a series of complex interactions within the body, involving both the immune system and metabolic processes. In the case of pregnant cows, these mechanisms are essential for supporting the developing fetus and maintaining the overall health of the mother. The aim of the work was to study the hematological, biochemical, and immunological parameters of cows at different periods of pregnancy. Research was conducted on cows (Bos Taurus) of the Ukrainian Black-and-White dairy breed. Groups were formed based on the principle of analogs. The research was carried out using the methodology of group-period experiments. The control group consisted of non-pregnant cows. The first observation period was conducted on pregnant cows with confirmed pregnancy (30 days). The second observation period was carried out at 90 days of pregnancy, the third at 180 days of gestation, and the fourth at 270 days. Laboratory studies included immunological research conducted in the specialized laboratory of immunology for reproduction animals. The first notable observation was the gradual increase in the population of CD3+ lymphocytes from the beginning of gestation, which remained stable until the 90th day of pregnancy and then gradually decreased. The population of B cell immune cells CD22+ had its peculiarities: dynamic and stable growth from the start of pregnancy until the middle of the second trimester (180 days), followed by a gradual decrease until the onset of labor. The redistribution of T and B lymphocytes occurred with dynamic fluctuations in the number of undifferentiated 0-lymphocytes. The processes of transformation and adaptation of homeostasis affected both enzyme activity and indicators of mineral metabolism. Thus, from the beginning of pregnancy (from the 30th day of gestation), the experimental cows showed a significant increase in alkaline phosphatase activity (P < 0.05), alanine aminotransferase (P < 0.05), and aspartate aminotransferase activity (P < 0.05). During the pregnancy of cows, body changes occur. From the early period of gestation throughout the entire period of embryogenesis, changes in the system of hematopoiesis, alterations in the activity of enzymes, exchange of Ca and P, accompanied by changes in immunological reactions take place. These processes are adaptive and ensure the maintenance of the homeostasis system. The perspective of further research will aim at studying changes in immunological and biochemical parameters during physiological pregnancy and when it is complicated.