Effects of three methane mitigation agents on parameters of kinetics of total and hydrogen gas production, ruminal fermentation and hydrogen balance using in vitro technique
2016
Wang, Min | Wang, Rong | Yang, Shan | Deng, Jin Ping | Tang, Shao Xun | Tan, Zhi Liang
Methane (CH₄) can be mitigated through directly inhibiting methanogen activity and starving methanogens by hydrogen (H₂) sink. Three types of mechanism (i.e. bromoethanesulphonate (BES), nitrate and emodin) and doses of CH₄ mitigation agents were employed to investigate their pathways of CH₄ inhibition. Results indicated that both BES and emodin inhibited CH₄ production and altered H₂ balance, which could be accompanied by decreased dry matter disappearance (DMD), fractional rate of gH₂ formation, volatile fatty acid (VFA) production, ability to produce and use reducing equivalences and molecular H₂, and increased final asymptotic gH₂ production, time to the peak of gH₂, discrete lag time of gH₂ production and fermentation efficiency. However, emodin decreased gas volume produced by rapidly fermentable components of substrate and the rate of fermentation at early stage of incubation, while BES supplementation inhibited gas volume produced by both rapidly and slowly fermentable components of substrate and the rate of fermentation at middle or late stage of incubation. The nitrate supplementation inhibited CH₄ production without affecting VFA profile, because of its dual role as H₂ sink and being toxic to methanogens. Nitrate supplementation had more complicated pattern of fermentation, VFA production and profile and H₂ balance in comparison to BES and emodin supplementation.
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