Keywords: period, stabilization, leukocytes, resistance, calves


The growth and development of the animal organism in the process of vital activity goes through critical periods, and the formation of body functions at the level of adult animals occurs before the stabilization period. However, the formation of body systems in the postnatal period, their functional activity depends on the state of the body at birth. In general, the conditions of prenatal development, especially hypoxia, negatively affect the subsequent maturation of the organism, the formation of its protection mechanisms against the influence of various negative factors of existence. It was established that during the period of stabilization of the growth and development of the calves, the resistance indices and the activity of blood leukocytes of the calves that were under the influence of hypoxia during the prenatal period of growth and development, were born with signs of respiratory disorders were probably lower, or remained probably less, than in functionally active calves animals Thus, LII in the calves of the control group was 1.35 times less than this index of the calves of the experimental group, and the leukocyte shift index was 2.59 times less than that of the experimental animals (p<0.001). The leukocyte index and NLC in the control animals were 1.18 (p<0.05) – 3.38 times less compared to the calves of the experimental group (p<0.001). The number of leukocytes in the blood of functionally active calves corresponded to the indicator of physiologically mature animals, while it remained 1.32 times more in the calves of the second group (p<0.05). The percentage of basophils in the leukocytic form did not change significantly compared to the indicators of the retardation period. Compared to the period of retardation, the percentage of rod and segment nuclear leukocytes in the blood of calves of the first group practically did not change. In the calves of the second group, it was unlikely that the content of the main forms of neutrophils was higher. Along with this, neutrophils in the blood of calves of the first group were determined to be 1.88 times less compared to the indicators of calves of the second group. The content of lymphocytes varied from the period of retardation to the period of stabilization in the blood of the calves of the first group from 71.05±4.03% to 70.0±5.0%. In the animals of the experimental group, this indicator increased from 40.65±2.40% to 44.35±4.95% and remained during the stabilization period 1.58 times less in animals of the first group. There were 2.20 times more monocytes in the blood of calves of the second group (p<0.01). The results of the research indicate a decrease in the activity of the processes of formation of protective mechanisms in calves before the stabilization period, the prenatal period of which took place under the influence of hypoxia.


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How to Cite
KolenchenkoV. А. (2023). LEUKOCYTE ACTIVITY AND INDICATORS OF THE RESISTANCE OF THE CALVES IN THE PERIOD OF STABILIZATION OF GROWTH AND DEVELOPMENT. Bulletin of Sumy National Agrarian University. The Series: Veterinary Medicine, (4(63), 83-86. https://doi.org/10.32782/bsnau.vet.2023.4.13