| Summary: | <i>Bifidobacterium animalis</i> A12 was used for the development of fermented sausage. The growth activity, tolerance, and enzyme activity of <i>B. animalis</i> A12 and its contribution to the texture and flavour of fermented sausages were evaluated. Additionally, the sensory texture, flavour components, and amino acid nutrients during the fermentation process were assessed. <i>B. animalis</i> had high tolerance to NaCl and nitrite, and <i>B. animalis</i> A12 had protease and lipase activities. The pH value of sausage fermented with <i>B. animalis</i> A12 was lower than that of sausage fermented without any fermentation strain. Hexanal, heptanal, decanal, cis-2-decanal, and 4-methoxy-benzaldehyde are the unique aldehydes flavour components of fermented sausages in the A12 group. The highest content of volatile flavour substances and amino acids, and the color and texture characteristics of fermented sausage in the experimental group at 18 h were better than those at other times. These results suggest that <i>B. animalis</i> A12 has the potential to be used as a starter culture for im-proving flavour and texture in fermented sausage.
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