Body resistance of calves during the imprinting period of growth and development

Abstract

The results of the conducted research allow us to assert the different level of resistance of the body of calves at the end of the imprinting period, depending on the functional state of the body at birth. In calves born with signs of hypoxia, during the imprinting period, the number of leukocytes in the blood was 1.54 times higher than in functionally active animals. The number of neutrophils in the blood of the calves of the second group was 2.39 times more (p>0.001), and lymphocytes were 1.49 times less (p<0.001). The phagocytic activity of leukocytes in the blood of functionally active calves in the imprinting period of life was significantly higher than in calves born with signs of hypoxia. The phagocytic number of leukocytes in the blood of the calves of the first group was 1.40 times higher, and the phagocytic index was 15.70% more than that of the animals of the control group. At the end of the imprinting period, the resistance index of calves of the control group was 3.47 times higher than this index of calves of the experimental group. The percentage of active leukocytes (AL) reached 38.35 ± 2.17% in the calves of the first group and 13.63 ± 1.01% in the calves of the experimental group. The number of active lymphocytes in the blood of calves of the control group was found to be 1.83 times higher, and microbes were neutralized 2.18 times more than the white blood cells of the calves of the experimental group. The research results indicate the negative impact of hypoxia on the growth and development of the fetus. In newborn calves, adaptation to new living conditions was significantly less than in functionally active calves. The decrease in the resistance of the body of calves born with signs of hypoxia is most pronounced in the imprinting period of growth and development of animals.