Effect of adding wet hulless barley distillers’ grains on fermentation quality of mixed ensilage of hulless barley straw and tall fescue in Tibet

Abstract

Abstract: The effect of adding wet, hulless barley distillers’ grains (WHDG) on the fermentation quality in mixed silage of hulless barley (Hordeum vulgare) straw and tall fescue (Festuca arundinacea) during ensiling was assessed. There were three treatments of different WHDG addition ratios (10%, 20% and 30% of fresh weight) plus a control. The silos were opened on 7, 14 and 30 days after ensiling and the fermentation quality was analyzed. WHDG addition significantly improved the mixed silage fermentation quality, as indicated by a sharp accumulation of lactic acid (LA) (P<0.05), faster decline of pH, lower butyric acid content (BA) and NH₃-N/total N (P<0.05) as compared with control silage. These results indicated that WHDG addition not only effectively inhibited the activity of aerobic bacteria, but also speeded-up and greatly enhanced lactic acid production and pH reduction. This restricted the utilization of water soluble carbohydrate by undesirable bacteria and reduced the loss of water soluble carbohydrate, leaving more residual water soluble carbohydrate for lactic acid bacteria. From results of the present study, it is suggested that 20% WHDG addition is effective for improving the fermentation quality of mixed ensilage of hulless barley straw and tall fescue.

CLC Number:

S816.6

YUAN Xian-jun, YU Cheng-qun, LI Zhi-hua, Masataka Shimojo, SHAO Tao. Effect of adding wet hulless barley distillers’ grains on fermentation quality of mixed ensilage of hulless barley straw and tall fescue in Tibet[J]. Acta Prataculturae Sinica, 2012, 21(2): 92-98.

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