Аннотация
Against the background of the use of a probiotic feed additive at a rate of 0.3 g/kg and 0.4 g/kg of fodder, in experimental calves, compared with the controlanalogs, there was a significant increase in the average daily weight gain on the 15th day of the experiment by 4.60-4.90%, on the 30th day - by 5.87 - 6.34%, on the 60th day - by 7.48 - 7.81%, in the blood of animals the number of red blood cells increased by 3.69 - 4.54%, leukocytes - by 1.48 - 1.75%, hemoglobin - by 6.39 - 7.59%, in blood serum the level of total protein - by 3.28 - 3.31% (P<0.05), albumin - by 2.08 - 2.69% (P<0.05), globulins - by 3.70 - 4.20% (P<0.05), gamma globulins - by 12.41 - 12.91 % (P<0.01). Introduction to the diet of calves of the specified probiotic feed additive promoted a slight increase of immunoglobulins A in blood serum in the experimental calves, in relation to the control analogues, in both experimental groups of animals by 5.00% (P<0.05), immunoglobulins M - by 4.43 - 5.64% (P<0.01), immunoglobulins G - by 5.69 - 5.90% (P<0.05), increasing the preservation of calves - by 3.22 - 3.69% (P<0.05).