The article presents the results of a study on the effect of a probiotic preparation based on lactic acid bacteria (Lactobacillus plantarum spp.) and propionic acid bacteria (Propionibacterium freudenreichii spp.) on the biochemical parameters of blood serum in the Russian Black Pied calves during the milk feeding period. The study was conducted in 2024 at the Federal Altai Scientific Center of Agrobiotechnologies – breeding farm “Komsomolskoye” in the Pavlovsky District of the Altai Territory, on two groups of analog calves (n = 10 in each group) aged 10 days with an average live weight of 52.9 kg. Animals in the experimental group received a liquid biopreparation for 30 days according to an increasing dosage scheme of 40–70 mL per head per day. Blood serum biochemical parameters were determined 30 days after the completion of the feeding course using an automatic ChemWell Combi 2910 analyzer. A significant increase was found in albumins by 2.3%, α globulins by 3.2%, β globulins by 4.2%, and γ globulins by 14.6% in the blood of calves in the experimental group compared to the control. A decrease in cholesterol levels by 5.3% and phosphorus by 16.7% was revealed, within the physiological norm. The use of the probiotic had a positive effect on productive performance: average daily live weight gain significantly increased by 27.7 g, and live weight at 9 months of age increased by 3.0%. The results obtained indicate a positive effect of the preparation on metabolism and the physiological state of calves, which opens prospects for its application in production settings
Keywords
Probiotic, calves, blood biochemistry, Lactobacillus plantarum, Propionibacterium freudenreichii, protein metabolism, globulins, albumins, live weight, milk feeding period