Physiological Characteristics of Platelet Activity in Calves of the Dairy and Plant Nutrition of the Holstein Breed

The hemostatic properties of platelets to a large degree determine the activity metabolic processes that have great biological significance especially in early ontogeny. This study was conducted on 43 calves Holstein breed during phase milk-vegetable diet. It found observation period indicators were stable between 31 and 60 days life, platelet aggregation weakened. In blood there slight increase number discocytes. total active thrombocytes observed after stability 31-60 life decreased follow-up observation. levels circulating aggregates small sizes 90 by 66.7% 2.5 times, respectively. contributed weakening calves’ synthesis thromboxane, decrease content adenosinfosfatom, inhibition their secretion. During period, actin myosin animals also decreased, which reduced overall activity. second part lacto-vegetarian nutrition, exposed aggregate weakened calves. counts at age typical, changed physiologically acceptable end observation.
 Keywords: calves, dairy plant phase, breed, platelets, aggregation, secretion