Activity of platelet hemostasis in newborn calves.

摘要

Healthy newborn Simmental and Black Pied calves with a normal number of platelets in bloodstream don't have reliable dynamics of the aggregation function of blood platelets with adenosine diphosphate, collagen, thrombin, ristocetin, epinephrine, as well as combinations of ADP+epinephrine, ADP+collagen, and collagen+epinephrine inducers. The level of discocytes in blood on days 1-2 was 78.5, not reliably changing until the end of the neonatal stage. In this case, the number of disco-echinocytes, spherocytes, spheroechinocytes, and bipolar forms of platelets in the bloodstream remained stably low. Maintenance during colostrum feeding of a low intensity of metabolism of endogenous arachidonic acid in platelets and of a low content of ATP, ADP, actin, and myosin in them can be considered important mechanisms providing stability of platelet aggregation activity in calves in the neonatal stage.Notes Translated from Doklady Rossiiskoi Akademii Sel'skokhozyaistvennykh Nauk (2011) No. 5, 32-34 (Ru).