The use of exogenous feed enzymes in the nutrition of ruminants

Relevance. By splitting the nutrients of the feed, improving the amylolytic, proteolytic, and cellulolytic activity of the scar fluid and its digestibility, the fungal alkaline protease and fungal alpha-amylase enzymes used can significantly enhance the vital activity of the symbiotic microflora of the scar, which is determined by their interaction with other enzymes. The aim of the study was to study changes in the concentration of LDL, the digestibility of feed, as well as morphological and biochemical parameters of calves’ blood when the enzymes fungal alkaline protease and fungal alpha-amylase were introduced into the diet. Materials and methods. Scar tissue for the study was obtained from Kazakh white-headed bull calves (n = 4), with an average weight of 310–2320 kg at the age of 14–15 months. The animals of the control and experimental groups were on a basic balanced diet, and enzyme preparations were added to the diet of the calves of the experimental groups as part of concentrated feed: I experimental — fungal alkaline protease 25 g/t; II experimental — fungal alkaline protease 50 g/t; III experimental — fungal alpha-amylase 25 g/t; IV experimental — alpha-amylase mushroom 50 g/t. Results and conclusions. The results of the experiment showed that the best dosage of mushroom alkaline protease was 25 g/t, and mushroom alpha-amylase was 50 g/t. Their presence in the diet led to a change in the LVF in the scar content, improved the digestibility of dry matter and crude protein, which contributes to a high level of scar digestion processes, and this significantly affected the morphological and biochemical parameters of animal blood.