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Effect of grape pomace on fermentation quality and aerobic stability of sweet sorghum silage
Author(s) -
Li Ping,
Shen Yixin,
You Minghong,
Zhang Yu,
Yan Jiajun,
Li Daxue,
Bai Shiqie
Publication year - 2017
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12791
Subject(s) - silage , lactic acid , fermentation , food science , butyric acid , pomace , microbial inoculant , chemistry , polyphenol , lactobacillus plantarum , food spoilage , lactic acid fermentation , biology , biochemistry , bacteria , antioxidant , genetics
The objective of this study was to evaluate the effect of grape pomace ( GP ) with different adding levels (0%, 5%, 10% and 15%, fresh matter basis), alone ( GP ‐ LAB ) or in combine with an inoculant LAB ( GP + LAB ), on the fermentation quality and aerobic stability of sweet sorghum silage. After 90 days of ensiling in vacuumized mini‐silos, silages were subject to a 7‐day aerobic stability test, in which chemical, microbial and polyphenol composition were measured. In the GP ‐ LAB group, adding GP decreased ( P < 0.05) concentrations of water‐soluble carbohydrate ( WSC) and butyric acid in silage. In the GP + LAB group, adding GP increased ( P < 0.05) concentrations of lactic acid, WSC and crude protein, decreased ( P < 0.05) final pH value, NH 3 ‐N ratio and butyric acid concentration in silage. Polyphenol level was reduced ( P < 0.05) after silage fermentation. During aerobic exposure, the fungi count, pH value and silage temperature increased ( P < 0.05), the levels of lactic acid, acetic acid and polyphenols (quercetin 3‐O‐glucoside and quercetin 3‐O‐glucuronid) decreased ( P < 0.05) in silage. GP + LAB treated silage had a lag phase for aerobic spoilage. When the fermentation products, microbial counts, chemical and polyphenol composition were considered, the use of 10% GP + LAB at ensiling could provide a valuable source for improved fermentation quality and aerobic stability of sweet sorghum silage.