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Your search keyword '"Yuan, Xufeng"' showing total 2 results
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2 results on '"Yuan, Xufeng"'

1. The effects of fermentation and adsorption using lactic acid bacteria culture broth on the feed quality of rice straw

Author

Ren Ji-wei, Wang Xiaofen, Liu Xiao-ping, Cui Zongjun, Abdelfattah Z.M. Salem, Yuan XuFeng, Liu JingJing, and Zhao Hong-yan

Subjects
animal structures, lactic acid bacteria culture broth, Agriculture (General), Forage, Plant Science, Biochemistry, S1-972, chemistry.chemical_compound, Food Animals, Botany, Dry matter, Palatability, Food science, fermentation, Ecology, biology, food and beverages, Straw, biology.organism_classification, Lactic acid, Neutral Detergent Fiber, chemistry, adsorption, rice straw, Animal Science and Zoology, Fermentation, Agronomy and Crop Science, Bacteria, Food Science
Abstract

To improve the nutritional value and the palatability of air-dried rice straw, culture broth of the lactic acid bacteria community SFC-2 was used to examine the effects of two different treatments, fermentation and adsorption. Air-dried and chopped rice straw was treated with either fermentation for 30 d after adding 1.5 L nutrient solution (50 mL inocula L−1, 1.2×1012 CFU mL−1 inocula) kg−1 straw dry matter, or spraying a large amount of culture broth (1.5 L kg−1 straw dry matter, 1.5×1011 CFU mL−1 culture broth) on the straw and allowing it to adsorb for 30 min. The feed quality and aerobic stability of the resulting forage were examined. Both treatments improved the feed quality of rice straw, and adsorption was better than fermentation for preserving nutrients and improving digestibility, as evidenced by higher dry matter (DM) and crude protein (CP) concentrations, lower neutral detergent fiber (NDF), acid detergent fiber (ADF) and NH3-N concentrations, as well as higher lactic acid production and in vitro digestibility of DM (IVDMD). The aerobic stability of the adsorbed straw and the fermented straw was 392 and 480 h, respectively. After being exposed to air, chemical components and microbial community of the fermented straw were more stable than the adsorbed straw.

Published
2015

2. Effect of dairy manure to switchgrass co-digestion ratio on methane production and the bacterial community in batch anaerobic digestion.

Author

Zheng, Zehui, Liu, Jinhuan, Yuan, Xufeng, Wang, Xiaofen, Zhu, Wanbin, Yang, Fuyu, and Cui, Zongjun

Subjects
*SWITCHGRASS, *FARM manure in methane production, *ANAEROBIC bacteria, *FEEDSTOCK, *BIOGAS production, *FERMENTATION, *POLYMERASE chain reaction
Abstract

The methane yield and microbial community resulting from co-digestion of dairy manure and switchgrass at different mixing ratios [4:0, 3:1, 2:2, 1:3, and 0:4 based on total solids (TS) content] were evaluated. The results indicated that switchgrass is an excellent feedstock for biogas production when co-digested with dairy manure. Mono-digestion of a high dose (>4% TS) of switchgrass led to volatile fatty acid accumulation and process failure, whereas co-digestion of switchgrass and dairy manure could increase the buffering capacity and improve the fermentation efficiency. The optimal mixture ratio of dairy manure and switchgrass was 2:2, with a methane yield that was 39% higher than that obtained by digestion of the individual substrates. The added amount of 8% TS at the 2:2 ratio achieved the highest methane yield of 158.6 mL/g VS, which corresponded to a 1.3-fold increase in the volumetric productivity of methane compared to mono-digestion of 4% TS switchgrass. Quantitative polymerase chain reaction and clone library analyses showed significant differences in the bacterial community resulting from the different co-substrate ratios. Planctomycetes (28%), Chloroflexi (24%), and Bacteroidetes (24%) were the dominant phyla in digesters with a co-substrate ratio of 2:2. [ABSTRACT FROM AUTHOR]

Published
2015
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