| Summary: | The article presents research data that allowed to establish the dynamics of hemocytopoiesis and the content of trace elements in the blood of sows of the first, second and third pregnancy. It is proved that sow pregnancy is accompanied by a probable increase in the number of erythrocytes and leukocytes in the blood and an incredible hemoglobin content, which we associate with the adaptive response of sows to the growth and development of fetuses. This direction of the processes of hemocytopoiesis is associated with the formation of the necessary physiological conditions for growth and development of fetuses, and in sows of the first pregnancy and for the full development of their own sows. It was found that in sows of the second pregnancy the content of microelements in the blood remained higher than in experimental animals of the first group. Thus, the content of copper in the blood of experimental animals of the second group during the study was 1.07, 1.07 and 1.04 times higher than these indicators of experimental animals of the first group. This may be due to the fact that before the second farrowing is the physiological formation of the body of sows and the use of trace elements is only for the growth and development of the fetus. However, during the experiment, the content of copper and iron in the blood of sows of the second control group was, respectively, 1.04 - 1.10 times and 1.08–1.10 times higher than these indicators of the blood of sows of the experimental group. Significantly less, 1.06, 1.21 (p <0.01) and 1.11 times (p <0.05) was the content of selenium in the blood of animals of the experimental group. In our opinion, this is very important given the role of the above trace elements in the activity of enzymes such as carbonic anhydrase, glutathione peroxidase, catalase, peroxidase. We found a probable decrease in the content of selenium, cobalt and zinc in the blood of animals of all experimental groups, regardless of pregnancy.
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