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The effects of wilting and storage temperatures on the fermentation quality and aerobic stability of stylo silage

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In order to clarify the ensiling characteristics of stylo (Stylosanthes guianensis Swartz), the effects of wilting (no wilting, light wilting and heavy wilting) and storage temperatures (10°C, 20°C, 30°C and 40°C) on the fermentation quality and aerobic stability of stylo silage were investigated. Wilting had no significant influence on the contents of crude protein, ether extract and acid detergent fiber, and numbers of lactic acid bacteria, aerobic bacteria, yeasts and mold (P > 0.05). Heavy wilted material, wilted for 12 h, had higher neutral detergent fiber content and lower water‐soluble carbohydrate content than unwilted and light wilted materials (P < 0.05). Wilting and storage temperatures had significant effects on pH value, acetic acid, butyric acid and NH3‐N contents of stylo silage (P < 0.01 or P < 0.05). Wilting tended to reduce acetic acid and NH3‐N contents and improve the fermentation quality of stylo silage. In all the silages, no wilting silage ensiled at 30°C had the highest butyric acid content (P < 0.05). High temperature of 40°C markedly restricted the growth of lactic acid bacteria and aerobic bacteria in silage, irrespective of wilting. The wilted silage or silage stored at low temperature had poor aerobic stability.
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Document Type: Research Article

Affiliations: 1: Department of Grassland Science, South China Agricultural University, Guangzhou 2: Pratacultural College, Gansu Agricultural University, Lanzhou 3: Grassland Research Institute, CAAS, Huhhot, China

Publication date: August 1, 2011

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