THE ROLE OF BLOOD CELLS IN IMMUNE ALTERATION OF AN ORGANISM AT THE EARLY STAGES OF COWS PREGNANCY
The leukocyte blood composition of cows during the first month of pregnancy has been studied. It is found that at the early stages of pregnancy the condition of the immune system of cows is the result of interrelations between the fetus and the mother's body. Besides, the leukocyte blood composition, as an indicator of immune alteration in the pregnant animals’ body, varies with the development and growth of the embryo. In the first 2 weeks of pregnancy there occurs significant enhancement of immune response of the mother's body to antigens of the fetus, which is manifested in the increase of total leukocytes concentration in blood and the percentage of eosinophils and segmented neutrophils in the leukogram. After the implantation of the embryo (the 3d, 4th week of pregnancy) there appear signs of the body's immune reactivity oppression against its tolerance to the developing fetus.