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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0045    [Accepted] Published online April 12, 2018.
In vitro evaluations of Rhus succedanea extracts for ruminants
Sung Sill Lee1,*  , Do Hyung Kim1  , Shin Ja Lee3  , Da Som Oh4  , Il Dong Lee5  , Jun Sik Eom6  , Ha Young Park7  , Sung Ho Choi8 
1GyeongSang National University, Jinju-city, Korea
2Department of Animal Science, Gyeongbuk Provincial College, Yecheon, Korea
3Institute of Agriculture and Life Science and University-Centered Labs, Gyeongsang National University, Jinju, Korea
4Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Korea
5Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Korea
6Division of Applied Life Science (BK21 Program) and Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Korea
7Department of Pathology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea
8Department of Animal Science, Chungbuk National University, Cheongju, Korea
Correspondence:  Sung Sill Lee, Tel: 82-55-772-1883, Fax: 82-55-772-1889, Email: lss@gnu.ac.kr
Received: 10 January 2018   • Revised: 13 February 2018   • Accepted: 10 April 2018
Abstract
Objective: This study was conducted to evaluate the effects of additional levels of Rhus succedanea extracts on in vitro ruminal fermentation and microbial growth.

Methods

Two ruminally-fistulated steer 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 supplied by the timothy as a substrate was conducted for up to 72 h with Rhus succedanea extracts which was dosed to achieve final concentrations of 0, 10, 30, 50, 70, and 90 mg/L, respectively.

Results

Effective dry matter degradability rate was linearly decreased (P = 0.046) depend on dosing levels. Total gas production for 24 to 72 h incubation seem to tendency decrease by 50 mg/L dosing as a starting point (quadratic effects, P = 0.006, < 0.001, and = 0.008 for 24, 48, and 72 h, respectively). Methane production was decreased depend on dosing levels at 24 h (P < 0.05) and 48 h (P < 0.005) incubations which was lowest at 50 mg/L dosing. The dose of 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) at 24 h incubation.
Conclusion
This study was shown to reduce methane production and increase cellulolytic bacteria without any signs of toxic effects and a minor effect on DM degradability.
Keywords: Rhus succedanea extracts; In vitro ruminal fermentation; Microbial growth


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