Haematological indicators in high-produced cows in dynamics of dry period

An analysis of literary sources on issues of a property of the blood and hemostasis suggests that this problem is a significant consideration given to human medicine. There is ongoing research on the properties of blood and systems of hemostasis in female animals at the time of feeding the fetus, their impact on the indices of reproductive function and viability of the offspring remains beyond the attention of researchers. The goal of the work was to study the dynamics of haematological parameters in cows of Holstein Black-and-White breed during the dry period. The research was carried out on the cows in the dynamics of the physiological course of the dry period (from the 8th to the 9th months of calving). Hematologic studies of blood samples taken from the cows in the course of the dry period were carried out according to generally accepted methods. The results of our research indicated that deep- calving cows show a decrease in the number of red blood cells, an increase in the number of leukocytes, an increase in the oxygen capacity of the blood and an increase in the colour index. The haemoglobin content and energy potential increased, the number of lymphocytes and neutrophils with segmental nucleus increased, and the number of neutrophils with a stick-shaped nucleus decreased as well. Consequently, the characteristics features of homeostasis of deep-calving cows are: reducing the number of erythrocytes and increasing the number of leukocytes, increasing the oxygen capacity of the blood and increasing the color index, hemoglobin content and energy potential; an increasing the number of lymphocytes, segmental neutrophils, as well as reducing neutrophils with a stick-shaped nucleus. Further work will have a focus on determining the haematological parameters of high-yielding cows in the post-partum period for studying the overall resistance of the body, as well as the prediction and correction of obstetric pathology.