1[6]Kwon D V,Panda T.1999.Propionic acid production by whole cells of propionibacterium freudenreichii [J].Bioprocess Engineering,(20):109~116.
2[10]Yoshimaru T,Shibata M,Fukugomori T,et al.1999.Preparation and characteristics of rumen-bypass microcapsules for improvement of productivity in ruminants [J].J agric food chem,(47):554~557.