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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (2): 171-181.DOI: 10.11686/cyxb2020538

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Effects of hydrothermal treatment on in vitro fermentation, methanogenesis and microbiota of soybean straw

Cheng-fu ZHOU1,3,4(), Shui-ping WANG1,4(), Bai-zhong ZHANG2(), Xiu-min ZHANG3, Rong WANG3, Zhi-yuan MA3, Min WANG3   

  1. 1.College of Animal Science and Technology,Southwest University,Chongqing 402460,China
    2.Hunan Animal Husbandry and Veterinary Institute,Changsha 410131,China
    3.Key Laboratory of Agro-Ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
    4.Baiyu Muwang Agricultural Science and Technology Co,Ltd,Baiyu Yumu Kangyuan Animal Husbandry Science and Technology Co,Ltd. ,Baiyu 627150,China
  • Received:2020-12-08 Revised:2021-03-15 Online:2022-02-20 Published:2021-12-22
  • Contact: Bai-zhong ZHANG

Abstract:

The aim of this study was to investigate the effects of hydrothermal treatment on in vitro fermentation, methanogenesis and microbiota of soybean straw. The chemical compositions, the degradation characteristics, the fermentation parameters and the microbial ?ora were estimated for the soybean straws with and without hydrothermal treatment using an automatic ruminal fermentation system with 72 h of incubation. It was found that: The hydrothermal treatment reduced the concentrations of neutral detergent fiber (P<0.001), acid detergent fiber (P<0.001) and hemicellulose (P<0.001) in the soybean straw, and increased the concentrations of neutral detergent soluble fiber (P<0.001), water soluble carbohydrates (P<0.001), arabinose (P<0.001) and galactose (P<0.001). The hydrothermal treatment increased dry matter degradability (P<0.001) and volatile fatty acid concentration (P<0.05), and decreased the acetate:propionate concentration (P<0.001), the gas production of methane (P<0.001) and hydrogen (P<0.001) and the populations of fungi (P<0.01), methanogenic bacteria (P<0.05) and Fibrobacter succinogenesP<0.05). The results indicate that the hydrothermal treatment disrupted the cellulose-hemicellulose-lignin structural matrix of soybean straw, thereby increasing the soluble matter content, improving the ruminal degradation, leading to reduction in the number of fungi and methanogens, and decreased methane production.

Key words: hydrothermal treatment, soybean straw, in vitro fermentation, methanogenesis, ruminal microbiota