Abstract
Reducing methane emission from ruminant animals has implications not only for global environmental protection but also for efficient animal production. Tea saponins (TS) extracted from seeds, leaves or roots of tea plant are pentacyclic triterpenes. They have a lasting antiprotozoal effect, but little effect on the methanogen population in sheep. There was no significant correlation between the protozoa counts and methanogens. The TS decreased methanogen activity. It seems that TS influenced the activity of the methanogens indirectly via the depressed ciliate protozoal population. The TS addition decreased fungal population in the medium containing rumen liquor in in vitro fermentation, but no such effect was observed in the rumen liquor of sheep fed TS. Tea saponins had a minor effect on the pattern of rumen fermentation and hence on nutrient digestion. When added at 3 g/day in diets, TS could improve daily weight gain and feed efficiency in goats. No positive associative effect existed between TS and disodium fumarate or soybean oil on methane suppression. Inclusion of TS in diets may be an effective way for improving feed efficiency in ruminants.
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Abbreviations
- DF:
-
Disodium fumarate
- DGGE:
-
Denaturing gradient gel electrophoresis
- DM:
-
Dry matter
- IPCC:
-
Intergovernmental Panel on Climate Change
- MCP:
-
Microbial protein
- mcrA:
-
Methyl-coenzyme M reductase
- SO:
-
Soybean oil
- TS:
-
Tea saponins
- TSDF:
-
Tea saponins plus disodium fumarate
- VFA:
-
Volatile fatty acids
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Acknowledgements
The work described in this article was carried out in collaboration with colleagues at the Institute of Dairy Science, College of Animal Sciences, Zhejiang University. We are thankful to Ms. Emma Gagen at CSIRO Livestock Industries, Australia, for critically reading the manuscript and revising the English language. Financial supports from the International Atom Energy Agency (No. 12665/R0) and the National Natural Science Foundation of China (No. 30972105) are acknowledged.
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Wang, JK., Ye, JA. & Liu, JX. Effects of tea saponins on rumen microbiota, rumen fermentation, methane production and growth performance—a review. Trop Anim Health Prod 44, 697–706 (2012). https://doi.org/10.1007/s11250-011-9960-8
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DOI: https://doi.org/10.1007/s11250-011-9960-8