Changes in microbial population and chemical composition of corn stover during field exposure and effects on silage fermentation anddigestibility

Asian-Australasian Journal of Animal Sciences

卷:32

Meiling Hou¹  Zhijun Wang²  Yimin Cai³  Ge Gentu⁴  Lin Sun⁴  Yushan Jia⁴ 

[1] College of Agriculture, Inner Mongolia University of Nationalities, Tongliao 028000, China;

[2] Inner Mongolia Institute of Grassland Surveying and Planning, Hohhot, Inner Mongolia 010051, China;

[3] Japan International Research Center for Agricultural Science (JIRCAS), Tsukuba, Ibaraki 305-8686, Japan;

[4] Key Laboratory of Grassland Resources, Ministry of Education, P.R. of China, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010019, China;

关键词: Chemical Composition;    Corn Stover;    Digestibility;    Field Exposure;    Silage Fermentation;   

DOI  :  10.5713/ajas.18.0514

来源: DOAJ

【 摘 要 】

Objective To effectively use corn stover resources as animal feed, the changes in microbial population and chemical composition of corn stover during field exposure, and their silage fermentation and in vitro digestibility were studied. Methods Corn cultivars (Jintian, Jinnuo, and Xianyu) stovers from 4 random sections of the field were harvested at the preliminary dough stage of maturity on September 2, 2015. The corn stover exposed in the field for 0, 7, 15, 30, 60, 90, and 180 d, and their silages at 60 d of ensiling were used for the analysis of microbial population, chemical composition, fermentation quality, and in vitro digestibility. Data were analyzed with a completely randomized 3×6 [corn stover cultivar (C)×exposure d (D)] factorial treatment design. Analysis of variance was performed using SAS ver. 9.0 software (SAS Institute Inc., Cary, NC, USA). Results Aerobic bacteria were dominant population in fresh corn stover. After ensiling, the lactic acid bacteria (LAB) became the dominant bacteria, while other microbes decreased or dropped below the detection level. The crude protein (CP) and water-soluble carbohydrate (WSC) for fresh stover were 6.74% to 9.51% and 11.75% to 13.21% on a dry matter basis, respectively. After exposure, the CP and WSC contents decreased greatly. Fresh stover had a relatively low dry matter while high WSC content and LAB counts, producing silage of good quality, but the dry stover did not. Silage fermentation inhibited nutrient loss and improved the fermentation quality and in vitro digestibility. Conclusion The results confirm that fresh corn stover has good ensiling characteristics and that it can produce silage of good quality.

【 授权许可】

Unknown