Biochemical blood parameters and dynamics of live weight of calves when using probiotic strains of Bacillus subtilis and Bacillus megaterium

The data on the use of probiotic strains Bacillus subtilis and Bacillus megaterium in feeding of young cattle have been presented in the experimental article. Probiotics help to prevent gastrointestinal disorders in calves during the preweaning period. Due to the action of these strains, beneficial microflora develops in the animal’s body and pathogenic microorganisms are suppressed by competitive exclusion. The purpose of the research was to substantiate the eff ectiveness of using probiotic bacteria Bacillus subtilis and Bacillus megaterium to improve physiological and productive indicators in calves during the preweaning period. Experimental groups of animals were formed based on the principle of analogues. In the experimental group probiotic strains Bacillus subtilis and Bacillus megaterium were used, and in the control group probiotic strain Ruminococcus albus was used. The research was carried out on clinically healthy animals for 51 days, the period of feeding probiotics was 30 days. It was found as a result of the scientific and production experiment that the use of probiotic strains Bacillus subtilis and Bacillus megaterium had a positive infl uence on physiological changes in the blood serum of calves. During the period of feeding the probiotic an increase in the absolute and daily average gain in live weight of young animals in the experimental group was noted by 0.84 kg and 27.78 g, respectively. Upon completion of the experiment, the growth rate of calves was 25.83 kg of absolute gain and 1230 g of average daily gain, and in the intact group it was 23.33 kg and 1111 g, respectively. The use of probiotic strains Bacillus subtilis and Bacillus megaterium in calf diets promotes increased absorption of nutrients, which has a positive eff ect on their growth and development.