Changes in microbial community structure, methanogenesis and rumen fermentation in response to saponin-rich fractions from different plant materials - PubMed (original) (raw)

Comparative Study

Changes in microbial community structure, methanogenesis and rumen fermentation in response to saponin-rich fractions from different plant materials

G Goel et al. J Appl Microbiol. 2008 Sep.

Abstract

Aims: Investigation of the effects of saponin-rich fractions on rumen fermentation, methane production and the microbial community.

Methods and results: Saponins were extracted from Carduus, Sesbania and Knautia leaves and fenugreek seeds. Two levels of saponin-rich fractions with a substrate were incubated using the Hohenheim gas method. Methane was measured using an infrared-based methane analyser and microbial communities using quantitative PCR. On addition of saponin-rich fractions, methane and short-chain fatty acid production was not affected. The protozoal counts decreased by 10-39%. Sesbania saponins decreased methanogen population by 78%. Decrease in ruminal fungal population (20-60%) and increase in Fibrobacter succinogenes (21-45%) and Ruminococcus flavefaciens (23-40%) were observed.

Conclusions: The saponins evaluated possessed anti-protozoal activity; however, this activity did not lead to methane reduction. Fenugreek saponins seemed to have potential for increasing rumen efficiency. The saponins altered the microbial community towards proliferation of fibre-degrading bacteria and inhibition of fungal population.

Significance and impact of the study: The uni-directional relationship between protozoal numbers and methanogenesis, as affected by saponins, is not obligatory. All saponins might not hold promise for decreasing methane production from ruminants.

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