Biochemical indicators of the blood of calves and cows of ukrainian black-spotted dairy breed of different types of constitution in postnatal ontogenesis

Information on biochemical indicators of the blood of heifers and cows of different constitution types, which were evaluated according to the physiological and selection index developed by the authors, is presented.The control group included heifers and cows with low (104 units), and the experimental groupwith high (140 and above) index indicators.In dynamics (heifers 3; 6; 12 and 18 months old, heifers at 8-9 months of gestation and cows at 2-3 months of lactation), changes in morphological and biochemical indicators of blood, in particular the number of erythrocytes and hemoglobin content in blood, were investigated, the level was determined protein metabolism based on the analysis of data on the content of total protein, the activity of aspartate and alanine aminotransferases, the content of total, residual and protein SH-groups, individual enzymes involved in redox processes in the blood were investigated, namely the content of total, reduced and oxidized glutathione and the activity of the enzyme catalase, data were given on the physiological selection index for assessing the type of constitution of heifers of the Ukrainian black-spotted dairy breed.It was established that the main indicators characterizing the course of biochemical processes in all studied age periods were higher in the animals of the experimental group (with a high physiological selection index), which indicates a more intensive metabolism in their body.than the counterparts of the control group.