The use of probiotics and enzyme preparations in poultry diets to intensify digestive metabolism in the body is a very pressing problem. The aim of the research was to study the effect of enzyme preparations of protosubtilin GZh and celloviridineG20h, as well as the probiotics of bifidumbacterin on the processes of digestive metabolism in growing birds and laying hens. In the course of the studies, it was found that the joint supplementation of the probiotic BifidumSKhZh at the rate of 5 g per 200 heads, enzyme preparations of protosubtilin GZh at the rate of 300 g/t and celloviridineG20h at the rate of 100 g/t of the feed allowed the growing birds and laying hens of the 4th experimental group significantly (P>0.95) exceed their control analogues in the proteolytic, cellulosolytic and amylolytic activity of the contents of the gizzard stomach and duodenum, in digestibility of crude protein, crude fiber, and nitrogen-free extracts (NFE) of the diets, as well as the level of protein digestibility of forages.

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