DefinePK

Abstract

Of great interest to calves are probiotics, which prevent gastrointestinal tract diseases, increase the activity of digestive enzymes, are able to produce a variety of antibiotic compounds that inhibit the growth of pathogens. Studies in the conditions of LLC “Agrofirm Bayramgul” of Uchalinsky district of the Republic of Bashkortostan found that the use of the probiotic “Stimix Zoostim” based on the microorganisms Escherichia coli, Lactobacillus acidophilus, Saccharomyces cerevisiae, Bacillus subtilis, Azotobaktervinelandii, Azotobakterchroococcum, positively influences the formation microbiocenosis of faeces, hematological blood indicators and growth rate of calves of the dairy period of the black-and-white Holstein breed of German breeding. The introduction of the probiotic “StimixZoostim” into the diets of the diary period in the amount of 10 ml per head at the age of 10-20 days, 15 ml – at the age of 21-90 days, contributes to the increase in the number of lactobacilli by 27.0%, bifidobacterium by 37.6%, with a decrease in the number of echerichia by 31.3%, compared with the first control group. The use of the probiotic “StimixZoostim” in rations of calves of the milk period, within the physiological norm, contributes to the increase in the number of red blood cells by 9.3%, hemoglobin – by 11.3%, ? – globulins – by 32.6%. These changes in the blood indicate a higher level of natural resistance and are characteristic of intensively growing calves. With 100% preservation of calves in the milk period in all groups, in the third and fourth experimental groups, the average daily growth in calves was higher by 8.9-10.2% with a decrease in feed costs per 1 kg of growth in live weight by 8.1-9.4% compared with the control group. However, in the fourth test group, the increase in the dose of the probiotic, equivalent to an increase in the growth rate of calves, did not occur. Thus, an effective dose of a probiotic is a dose of 10 ml per head per day at the age of 10-20 days, 15 ml at the age of 21-90 days. The results of the manufacturing inspection of the effective dose showed that the economic effect per head was 149.23 rubles.