Effect of the tissue bio-stimulant on live weight and growth rate of bull-calves during fattening

The purpose of research is to study the intensity of growth of black-and-white bulls during the fattening period under the influence of different doses of tissue biostimulant. Scientific and economic experiment was carried out in the production conditions of JSC Uchkhoz Prigorodnoye of the Altai Region of the Industrial District of Barnaul in 2021 on bull calves during the fattening period. To conduct the experiment on the principle of analogues, 4 experimental groups of bulls of 10 heads each were formed. When selecting animals, age (6 months) and live weight (185.0 kg) were taken into account. The duration of the experiment was 8 months. The tissue biostimulator was injected subcutaneously into the animals of the experimental groups in the area of the lower third of the neck from the 6th to the 14th month of rearing every month with an interval of 30 days in different doses according to the following schemes: I experimental group from 6 to 11 months - 8.0 mL per head, from 12 to 14 months - 10.0 mL per head; experimental group II from 6 to 11 months - 12.0 mL per head, from 12 to 14 months. - 15.0 mL per head; III experimental group from 6 to 11 months - 16.0 mL per head, from 12 to 14 months - 20.0 mL per head. Animals in the control group were injected with saline solution from the 6th to the 11th month at a dose of 12.0 ml/animal, from 12 to 14 month - 15.0 mL per head. During the experiment, it was revealed that the optimal scheme for using a tissue biostimulator promotes an increase in live weight up to 9.1% (p ≤ 0.001), an average daily increase in live weight by 27.7 % (p ≤ 0.001), an absolute increase in live weight by 27.1 % (p ≤ 0.001) and a relative increase in live weight by 2.4 % (p ≤ 0.001), is the administration of the drug from the 6th to the 11th month - 12.0 mL per head, from the 12th to the 14th month - 15.0 mL per head.