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Keeping swans in captivity leads to changes in their microbal background. The study of mucous membranes of larynx and cloaca as well as bedding and pool water aiming at investigation of composition of both residential and pathogenic microflora in swans was carried out. For this purpose culturalbiochemical, morphological, hemolytic and tinctorial properties of the obtained material were studied using general biological methods with subsequent identification of isolated cultures by Berdgi determinant. Microorganisms referring to 7 genera were isolated from the mucous membranes of the birds. 6 species of microbes belonging to genera Echerichia, Salmonella and Staphylococcus inhabit the mucous membranes of larynx and cloaca of 100% of birds under study. Three species of Staphylococci were found on the mucous membranes of larynx in the case of C.olor and on the mucous membranes of cloaca in the case of C.bewickii (S. Epidermidis, S. Aureus and S. saprophyticus). βhemolytic streptococcus was foumd on the mucous membranes of larynx in C. bewickii. Proteus was present on the mucous membranes of larynx in C.olor and the mucous membranes of cloaca in C. bewickii. Penicillium and Aspergillus were found in lavages from the mucous membranes of larynx and cloaca correspondingly in C.olor. Microorganisms referring to genera Echerichia, Salmonella, Staphylococcus (St. albus and St. saprophyticus), Streptococcus (β -hemolytic streptococcus), Bacillus, Mucor, Penicillium, Aspergillus were isolated from the bedding and Echerichia, Salmonella, Streptococcus (γ and β – streptococci) – from the pool water. Keywords—Swans, microorganisms, stress, contamination

Microbiocinosis Formation in Birds Kept in Captivity