Probiotic Substance in Combination with Zeolite Changes the Digestibility and Metabolism of Bulls

In the course of laboratory studies, we found that the porosity (in volume) of zeolite acetone is 34.4%. The sorption capacity of the studied zeolite to the Bifidobacterium longum strain together with the MRS nutrient medium was determined. As a result of the experiment, it was found that 100 g of zeolite absorbs 34 ml of nutrient medium with bifidobacteria. The optimal dose of feeding a complex probiotic preparation (CPP) – 30.5 g/day included 82% zeolite and 18% probiotic strain of Bifidobacterium longum. The coefficients of digestibility of nutrients were slightly higher in bulls from the experimental groups compared to their peers from the control group. So for dry matter, respectively, by 1.87%, 4.68 and 3.58%; crude protein by 2.22%, 5.00 and 3.48%; BEV by 1.24%, 3.19 and 2.20%. The control animals absorbed less nitrogen compared to the bulls of the I, II and III experimental groups by 14.52%, 30.14 and 21.78%. According to the use of the nitrogenous part of the rations, the animals of the experimental groups outperformed their counterparts from the control group by 2.13%, 5.00%, and 3.38%, respectively. On average, during the experiment period, the bulls of the I - III experimental groups had an advantage over the animals from the control group in absolute live weight gain by 1.4%, 14.9 and 6.7%, and in average daily weight gain by 1.4%, 14.8 and 6.7%.