Twenty strains of bacteria and 5 strains of basidiomycetes cultured under aerobic conditions and 9 strains of bacteria cultured under anaerobic conditions demonstrated high lactate dehydrogenase activity. One strain of basidiomycete cultured under aerobic conditions and 7 strains of yeasts cultured under anaerobic conditions demonstrated high curd rennet activity. The pHs cultured under aerobic and anaerobic conditions were between 6.1 and 7.1.