Tannase-producing bacteria isolated from the rumen of Fallow deer (Dama dama): Livestock potential feed additives

Introduction: Tannins are a group of polyphenolic compounds that are widely present in plants as an anti-nutritional factor. The rumen of wild ruminants contains novel microbes that detoxify antinutrients and improve feed digestion. The present study evaluated tannase-producing bacteria isolated from the rumen of Fallow deer (Dama dama), livestock potential feed additives.Materials and Methods: Tannase-producer bacteria (TPBs) were isolated from the rumen using a ۲% tannic acid- plate and tannase activity (TAA) assayed by the spectrophotometer method. The bacterial DNA was extracted through boiling and amplified using a PCR reaction. The Sanger technique and BLAST software were used to identify the strains. Antibacterial (ABA) and antibiogram tests were performed by the disc diffusion method, and the acid and bile resistance of isolates were examined using broth cultures.Results: The results indicated that TPBs belonged to Klebsiella, Enterobacter, and Escherichia genera. Escherichia fergusonii GHMGHE۴۴ (۹.۳۹ Uml-۱) and Enterobacter cloacae GHMGHE۲۶ (۱.۷۹ Uml-۱) were the strongest and weakest tannin degraders (p<۰.۰۱). Among the isolates, bile and acid resistance were insignificant (p>۰.۰۱) but E. fergusonii GHMGHE۲۸ (۹.۴۸ CFU ml-۱) had a significant survival rate compared to E. cloacae GHMGHE۲۵ (۹.۰۷ CFU ml-۱) at pH of ۷ (p<۰.۰۱). Also, K. pneumoniae subsp. rhinoscleromatis GHMGHE۲۷ (۳۲.۶۶ mm), E. coli GHMGHE۴۷ (۴۰.۶۶ mm), and E. fergusonii GHMGHE۴۸ (۲۴.۶۶ mm) were potently suppressed the pathogen E. Coli, S. aureus and P. aeruginosa, respectively (p<۰.۰۱). Against used antibiotics, E. asburiae GHMGHE۲۲ was the most sensitive isolate while others showed diverse reactions (p<۰.۰۱).Discussion and Conclusion: The findings showed that TPBs have the potential to study as commercial animal feed additives (AFA).

Keywords:

Escherichia fergusonii , tannase , Cellulase , European fallow deer