In vitro evaluation of Rhus succedanea extracts for ruminants

  • Kim, Do Hyung (Department of Animal Science, Gyeongbuk Provincial College) ;
  • Lee, Shin Ja (Institute of Agriculture and Life Science and University-Centered Labs, Gyeongsang National University) ;
  • Oh, Da Som (Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University) ;
  • Lee, Il Dong (Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University) ;
  • Eom, Jun Sik (Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University) ;
  • Park, Ha Young (Department of Pathology, Busan Paik Hospital, Inje University College of Medicine) ;
  • Choi, Seong Ho (Department of Animal Science, Chungbuk National University) ;
  • Lee, Sung Sill (Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University)
  • Received : 2018.01.10
  • Accepted : 2018.04.10
  • Published : 2018.10.01


Objective: This study was conducted to evaluate the effects of Rhus succedanea extract addition on in vitro ruminal fermentation and microbial growth. Methods: Two ruminally-fistulated steers consuming 600 g/kg timothy- and 400 g/kg cracked corn-based concentrate with free access to water and mineral block were used as rumen fluid donors. In vitro batch fermentation, with timothy as a substrate, was conducted for up to 72 h, with Rhus succedanea extracts added to achieve final concentrations of 0, 10, 30, 50, 70, and 90 mg/L. Results: Effective dry matter (DM) degradability rate linearly decreased (p = 0.046) depending on extract dosing levels. Total gas production after 24 to 72 h incubation tended to decrease following extract addition, beginning with 50 mg/L starting dose (significance of quadratic effects: p = 0.006, p<0.001, and p = 0.008 for 24, 48, and 72 h, respectively). Methane production decreased depending on dosing levels following 24 h (p<0.05) and 48 h (p<0.005) incubations and was the lowest with the 50 mg/L dose. The Rhus succedanea extracts increased the abundance of Fibrobacter succinogenes (p<0.05) and Ruminococcus flavefaciens (p = 0.0597) and decreased the abundance of methanogenic archaea (p<0.05) following 24 h incubation. Conclusion: Rhus succedanea was shown to reduce methane production and increase cellulolytic bacteria without any signs of toxic effects and with a minor effect on DM degradability.


Supported by : National Research Foundation of Korea


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