添加酶和乳酸菌制剂对西藏苇状羊茅和箭筈豌豆混合青贮发酵品质的影响

Effect of adding coenzyme and lactic acid bacteria on fermentation quality of mixed silages of tall fescue(Festuca arundinacea) and common vetch(Vicia sativa) in tibet

为评价添加酶、乳酸菌制剂和酶+乳酸菌制剂对苇状羊茅与箭筈豌豆(7∶3)混合青贮发酵品质的影响,试验设对照组(C)、酶制剂(E)、乳酸菌制剂(LAB)和酶+乳酸菌制剂(E+LAB)4个处理,3个重复,青贮后第7,24,60天开窖取样,测定青贮饲料发酵品质。结果表明,与对照组相比,添加酶或乳酸菌制剂能有效地改善混合青贮发酵品质,组合添加进一步提高了乳酸含量和降低了pH值。与对照组和单独添加乳酸菌组相比,在整个青贮过程中无论是酶单独添加还是组合添加都显示较高的乙酸和总挥发性脂肪酸含量,最高的水溶性碳水化合物含量和最低的氨态氮/总氮。这说明酶和乳酸菌制剂组合添加对改善青贮发酵品质有叠加效应。综上所述,酶和乳酸菌制剂组合添加能更好的改善苇状羊茅和箭筈豌豆混合青贮的发酵品质。

The aim of this study is to evaluate the effects of adding coenzyme,LAB and their combinations on the fermentation qualities and residual water soluble carbohydrates of mixed silages of common vetch and tall fescue during ensiling.The treatments were as follows： control（C）,coenzyme（E）,LAB,coenzyme＋LAB（E＋LAB）,these silos were opened on 7,24 and 60 days after ensiling and the fermentation quality was analyzed.Compared to the control silage,adding of E and LAB were efficient in improving the fermentation quality of mixed silages,and the combination addition further increased the LA content and decreased the pH value.The E combination treatments including the E alone showed higher acetic acid and total volatile fatty acids contents as compared with the control and LAB treated silages,the propionic and butyric acid were hardly found in all silages during ensiling.The combination treated silages showed highest water soluble carbohydrate content and lowest ammonia nitrogen/total nitrogen through the whole ensiling.These indicated that the E and LAB were of synergistic effects on the fermentation quality.From the above results it was suggested that the combination addition of coenzyme and LAB is better for improving the fermentation quality of mixed silages of common vetch and tall fescue in this experiment.