In the present study, we used three bacterial strains: Bacillus subtilis B3, B. cereus B7e, Flavobacterium multivorum P1 and one strain of yeast Geotrichum candidum PH1. Microscopic observation demonstrated, that all examined strains show adhesion and biofilm formation ability to a glass plate surface, in mono-as well as dual cultures. Furthermore, all strain synthetized and secreted extracellular keratinases in medium supplemented with poultry feathers as a single source od carbon and nitrogen. The highest keratynolityc activity was observed in single cultures of B. cereus B7c and F. multivorum P1, 21,7 J.K and 18,25 J.K, respectively. In the same medium, mixed cultures of B. cereus x F. multivorum and B. cereus x G. candidum as well as single culture of G. candidum PH1 showed lower keratynolityc activity (about 13 J.K.).

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