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Evaluation of in vitro digestibility of Aspergillus oryzae fungal biomass grown on organic residue derived‑VFAs as a promising ruminant feed supplement

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Journal of Animal Science and Biotechnology 2023年第6期14卷 2614-2629页

作者： Clarisse Uwineza Mohammadali Bouzarjomehr Milad Parchami Taner Sar Mohammad J.Taherzadeh Amir Mahboubi Swedish Centre for Resource Recovery University of Boras50190 BorasSweden

Background As demand for high quality animal feed continues to raise,it becomes increasingly important to mini-mize the environmental impact of feed *** appealing sustainable approach to provide feed fractions is to use organic residues from agro-food *** this regard,volatile fatty acids(VFAs)such as acetic,propionic and butyric acids,derived from bioconversion of organic residues can be used as precursors for production of micro-bial protein with ruminant feed inclusion *** study aims to investigate the in vitro digestibility of the Asper-gillus oryzae edible fungal biomass cultivated on VFAs-derived from anaerobic digestion of *** produced fungal protein biomass,along with hay clover silage and rapeseed meal were subjected to various in vitro assays using two-stage Tilley and Terry(TT),gas,and bag methods to evaluate and compare its digestibility for application in ruminant *** The produced fungal biomass contained a higher crude protein(CP)(41%–49%)and rather similar neutral detergent fiber(NDF)(41%–56%)compared to rapeseed *** rumen in vitro dry matter digestibility(IVDMD)of the fungal biomass in the TT method ranged from 82%to 88%(statistically similar to that of the gas method(72%to 85%)).The IVDMD of fungal biomass were up to 26%and 40%greater than that of hay clover silage and rapeseed meal,*** type of substrate and bag method had pronounced effect on the fermentation products(ammonium-N(NH4+-N),total gas and VFAs).Fungal biomass digestion resulted in the highest release of NH4+-N(340–540 mg/L)and the ratio of acetate to propionate ratio(3.5)among subjected *** The results indicate that gas method can be used as a reliable predictor for IVDMD as well as fermenta-tion ***,the high IVDMD and fermentation product observed for Aspergillus oryzae fungal biomass digestion,suggest that the supplementation of fungal biomass will contribute to improving the rumen diges

关键词： Aspergillus oryzae Fungal biomass in vitro dry matter digestibility Ruminant feed Volatile fatty acids

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Yield and Quality of‘Guangyi’ Whipgrass Forage at Varying Fertility Levels

Yield and Quality of‘Guangyi’ Whipgrass Forage at Varying ...

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中国—澳大利亚可持续性草地管理研讨会

作者： Liu Xiaobo Yang Chunhua~* Chen Lingzhi He Lingfei Shu Simin Department of Grassland Science Animal Science and Technological College Sichuan Agricultural Universit Ya’an 625014 Sichuan Province PRC.

＜正＞Introduction:‘Guangyi’ whipgrass（Hemarthria compressa cv. Guangyi） is extensive used in subtropical and tropical regions of China as a pasture and fodder *** to now,little experimental data are available on the relationship between soil fertility levels and forage quality of *** objectives of this study were to determine the effect of various levels of N,P,K on the yield and quality of whipgrass during production period,and evaluate the quality in relation to the Nutrient Requirements of Dairy Cattle（2001） established by the National Research Council（NRC）.

关键词： Whipgrass fertility levels dry matter yield forage quality in vitro dry matter digestibility

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