ITEMS OF RUMEN METABOLISM AND NUTRIENT DIGESTABILITY IN BULL-CALVES AT FEEDING SILAGE WITH ENZYME PREPARATION
The article presents a comparative study of feeding cereal-legume silages with the Ferkon preservative carried out within physiological researchers with fistula bull-calves. At the ascertained silage intake increase (19.5 kg as against 17.9 kg of the control), reliable increases in dry matter digestibility, 3.3%, raw protein, 3.8%, raw fiber, 5.5%, and anitrogenous extractive substances, 4.1%, have been revealed that are interconnected with changing the direction and intensity of microbiological processes in proventricula. The level of total microbial biomass in animals of the first group was higher than of the control one as before as after feeding (Table 2). Bacteria prevailed over protozoa in terms of biomass at the ratio of 1:0.6 before feeding and 1:0.7 in 3 hours after it. The article also says that in the experimental group bull-calve rumen fluid, the VFA level increases from 11.1 mmol/100 ml to 12.5 mmol/100 ml (P<0.05) in an hour after feeding and from 11.0 mmol/100 ml to 12.4 mmol/100 ml (P<0.05) in two hours after it have been revealed. A decrease in the acetic acid level from 68.48±0.11 to 65.48±0.21 with an increase in the propionic acid level from 12.72±0.32 to 14.92±0.10* (P<0.05) in three hours after feeding animals of the experimental group has been ascertained. It reports that nitrogen digestibility of the experimental group animals has been 68.8% as against 65.0% (P<0.05) in the control ones. As for nitrogen deposition in bull-calve organisms fed silage with Ferkon, it has increased by 5.4 g or 18.8% compared to the control conditioning the increase of their performance.