It was found that the preparations for the prevention and treatment of the escherichiosis of animals, obtained from aspen bark have the good sorption properties in relation to gelatin and methylene blue. It was experimentally established that the all obtained preparations can be used for the prevention and treatment of the escherichiosis of animals.

Good therapeutic and prophylactic properties have been proven for the sample of initial aspen bark at a dose of 0.15–0.20 g/kg and for the sample of aspen bark with supported arabinogalactan at a dose of 0.15 g/kg. The average level of therapeutic efficacy was established for the sample of extracted aspen bark at a dose of 0.15–0.20 g/kg. The highest efficacy in the treatment and prevention of acute experimental escherichiosis was established for the sample of “aspen fat” extracted by hexane from aspen bark, when administrated at optimal doses of 0/10–0.15 g/kg.