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Association of fibre degradation with ruminal dissolved hydrogen in growing beef bulls fed with two types of forages

  • Rong Wang (a1), Min Wang (a1), Bo Lin (a2), Zhi Yuan Ma (a1), Emilio M. Ungerfeld (a3), Ting Ting Wu (a2), Jiang Nan Wen (a1), Xiu Min Zhang (a1), Jin Ping Deng (a4) and Zhi Liang Tan (a1)...

Abstract

The present study investigated the association between fibre degradation and the concentration of dissolved molecular hydrogen (H2) in the rumen. Napier grass (NG) silage and corn stover (CS) silage were compared as forages with contrasting structures and degradation patterns. In the first experiment, CS silage had greater 48-h DM, neutral-detergent fibre (NDF) and acid-detergent fibre degradation, and total gas and methane (CH4) volumes, and lower 48-h H2 volume than NG silage in 48-h in vitro incubations. In the second experiment, twenty-four growing beef bulls were fed diets including 55 % (DM basis) NG or CS silages. Bulls fed the CS diet had greater DM intake (DMI), average daily gain, total-tract digestibility of OM and NDF, ruminal dissolved methane (dCH4) concentration and gene copies of protozoa, methanogens, Ruminococcus albus and R. flavefaciens, and had lower ruminal dH2 concentration, and molar proportions of valerate and isovalerate, in comparison with those fed the NG diet. There was a negative correlation between dH2 concentration and NDF digestibility in bulls fed the CS diet, and a lack of relationship between dH2 concentration and NDF digestibility with the NG diet. In summary, the fibre of CS silage was more easily degraded by rumen microorganisms than that of NG silage. Increased dCH4 concentration with the CS diet presumably led to the decreased ruminal dH2 concentration, which may be helpful for fibre degradation and growth of fibrolytic micro-organisms in the rumen.

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Corresponding author

*Corresponding author: Min Wang, fax +86 7314612685, email mwang@isa.ac.cn

References

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Association of fibre degradation with ruminal dissolved hydrogen in growing beef bulls fed with two types of forages

  • Rong Wang (a1), Min Wang (a1), Bo Lin (a2), Zhi Yuan Ma (a1), Emilio M. Ungerfeld (a3), Ting Ting Wu (a2), Jiang Nan Wen (a1), Xiu Min Zhang (a1), Jin Ping Deng (a4) and Zhi Liang Tan (a1)...

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