Functional activity of thrombocytes in calves of Yaroslavsky breed during the dairy nutrition phase

The hemostatic properties of platelets in calves can change as they grow. Of interest is the level of their activity in the phase of dairy nutrition in different breeds of cattle. The purpose of the work is to evaluate the dynamics of platelet activity in dairy calves of the Yaroslavl breed. The work was carried out on 43 calves of the milk supply phase of the Yaroslavl breed, which were obtained from healthy cows by 2-3 calving. Animals in the work were examined on the 11, 15, 20, 25 and 30 days of ontogenesis. The study used biochemical, hematological and statistical methods for conducting scientific research. During examination, an increase in platelet aggregation with all applied inducers was found in dairy calves. The content of discoid platelets in their blood during the observation tended to decrease. The level of platelets experienced activation during the second phase of early ontogenesis increased by 15.1 %. The blood content of calves of small aggregates, as well as medium and large aggregates, increased significantly during the observation period...