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DOI: https://doi.org/10.5713/ajas.20.0503    [Accepted] Published online November 9, 2020.
Pretreatments of Broussonetia papyrifera: In vitro assessment on gas and methane production, fermentation characteristic, and methanogenic archaea profile
Lifeng Dong1  , Yanhua Gao2  , Huiping Guo3  , Hongsen Zhang3  , Qi Lai2  , Qiyu Diao1,* 
1Feed Research Institute, Chinese Academy of Agricultural Sciences/Sino-US Joint Lab on Nutrition and Metabolism of Ruminant/CAAS-CIAT Joint Laboratory in Advanced Technologies for Sustainable Agriculture, Beijing, 100081, China
2College of Life Science and Technology, South Minzu University, Chengdu 610041, China
3College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
Correspondence:  Qiyu Diao, Tel: +86-010-82106055, Fax: +86-010-62166878, Email: diaoqiyu@caas.cn
Received: 20 July 2020   • Revised: 15 September 2020   • Accepted: 20 July 2020
The present study was conducted to examine the gas production, fermentation characteristics, nutrient degradation, and methanogenic community composition of the rumen fluid culture with Broussonetia papyrifera (B. papyrifera) subjected to ensiling or steam explosion (SE) pretreatment.
Fresh B. papyrifera was collected and pretreated by ensiling or steam explosion, which was then fermented with ruminal fluids as ensiled B. papyrifera (BPS) group, steam-exploded B. papyrifera (BP-SE) group, and untreated B. papyrifera (BP) group. The gas and methane production, fermentation characteristics, nutrient degradation, and methanogenic community were determined during the fermentation.
Cumulative methane production was significantly improved with SE pretreatment compared with ensiled or untreated biomass accompanied with more volatile fatty acids production. After 72 h incubation, SE and ensiling pretreatments decreased the acid detergent fiber contents by 39.4% and 22.9%, and neutral detergent fiber contents by 10.6% and 47.2%, respectively. Changes of methanogenic diversity and abundance of methanogenic archaea corresponded to the variations in fermentation pattern and methane production.
Compared with ensiling pretreatment, SE can be a promising technique for the efficient utilization of B. papyrifera, which would contribute to the sustainable livestock production systems.
Keywords: Broussonetia Papyrifera; Steam Explosion; Ensiling; In Vitro; Methanogenic Archaea

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