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Rumen content of the Rangifer tarandus is a promising source for the search for bacteria with high biological activity. Our objective was to screen isolates with high biological activity from the rumen content of reindeer in the Nenets and Yamalo-Nenets Autonomous Okrug of Russia. A total of 63 associations of microorganisms were investigated. Most of the studied associations showed the ability to decompose cellulose in the form of filter paper on the 3rd-6th day of incubation. 52 isolates demonstrated decomposition properties of carboxymethyl cellulose (according to data on the 3rd day of incubation). The results of the analysis of the cellulolytic activity of ten isolates that were selected as a result of screening according to the method of Henderson, Horvath and Block in the Churlis modification showed the level of cellulose decomposition from 4.0±0.34 to 62.0±4.1%. Four promising isolates selected at the next stage had the ability to biodegrade at least three mycotoxins. The highest level of biodegradation was observed for aflatoxins and reached 75.1±3.9%. The obtained experiments led to the conclusion that the isolates of microorganisms isolated from the reindeer rumen are capable of synthesizing cellulases and enzymes that biodegrade mycotoxins, which probably allows them to gain a competitive advantage in the rumen of a deer that consumes diets with an abundance of indigestible fiber and secondary metabolites with toxic properties. These strains are of undoubted interest for livestock (including dairy cattle and reindeer husbandry) with the aim of using them as environmentally friendly and safe probiotic feed additives. Keywords—rangifer tarandus, rumen, mycotoxin biodegradation, cellulolytic microorganisms.

Search and Isolation of Microorganisms from the Rangifer Tarandus Rumen Possessing Mycotoxin Biodegradation Potential and Cellulolytic Activity