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

Published online by Cambridge University Press:  28 July 2020

Rong Wang
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
Min Wang*
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
Bo Lin
Affiliation:
Department of Animal Science and Technology, University of Guangxi, Nanning, Guangxi 410128, People’s Republic of China
Zhi Yuan Ma
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
Emilio M. Ungerfeld
Affiliation:
Centro Regional de Investigación Carillanca, Instituto de Investigaciones Agropecuarias (INIA), Temuco, La Araucanía 4880000, Chile
Ting Ting Wu
Affiliation:
Department of Animal Science and Technology, University of Guangxi, Nanning, Guangxi 410128, People’s Republic of China
Jiang Nan Wen
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
Xiu Min Zhang
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
Jin Ping Deng
Affiliation:
Guangdong Provincial Key Laboratory of Animal Nutrition Control, Subtropical Institute of Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, Guangdong 510642, People’s Republic of China
Zhi Liang Tan
Affiliation:
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, People’s Republic of China
*
*Corresponding author: Min Wang, fax +86 7314612685, email mwang@isa.ac.cn

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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Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of The Nutrition Society

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