Abstract: In order to exert the complementary effect of whole plant maize and leguminous grass on livestock production and improve the utilization rate of forage grass in northwest Sichuan,whole plant maize,whole plant soybean and whole plant vicia sativa were used as experimental materials in this study,and a total of 5 treatments were set up:three forage grasses single silage,70% whole plant maize and 30% whole plant soybean,and 70% whole plant maize and 30% whole plant vicia sativa. Samples were taken for analysis after 30,60,90,and 120 days. The results showed that the whole plant maize mixed with legume grass significantly improved the crude protein content of corn and soluble carbohydrate and lactic acid content of leguminous grass,significantly decreased pH,AT/NT and butyrate in legume grasses (P<0.05). In the two mixed forage treatments,the content of soluble carbohydrates and lactic acid in the whole plant maize and whole plant Vicia sativa mixed silage group increased more,and the mean content of pH,propionic acid and butyric acid was the lowest,4.03,2.6 and 0.38 g·kg^-1DM,respectively. In conclusion,the mixed silage of whole plant maize,whole plant soybean and whole plant vicia sativa could better balance the nutritional quality of the two forages and obtain better silage,and the combination of whole plant maize and whole plant vicia sativa was better in the Northwest Plateau Area of Sichuan region.

Key words: the Northwest Plateau Area of Sichuan, Mixed silage, Fermentation time, Fermentation quality

摘要： 为发挥全株玉米与豆科牧草在家畜生产中的互补效应，提高川西北高原饲草利用率。本研究以全株玉米、全株大豆和全株箭筈豌豆为试验材料，设置三种饲草单独青贮及70%全株玉米和30%全株大豆混贮、70%全株玉米和30%全株箭筈豌豆混贮5个处理，采用聚乙烯袋密封保存30，60，90，120 d后开袋分析。结果表明：全株玉米与豆科牧草混贮可以显著提高全株玉米的粗蛋白含量和豆科牧草的可溶性碳水化合物及乳酸含量，显著降低豆科牧草的pH值、氨态氮及丁酸含量(P<0.05)。混贮处理中，全株玉米与全株箭筈豌豆混贮组的可溶性碳水化合物及乳酸含量增幅更大，pH值、丙酸、丁酸含量均值最低，分别为4.03，2.6和0.38 g·kg^-1DM。因此，全株玉米与全株大豆、全株箭筈豌豆混贮，可以均衡三种饲草的营养品质，获得更优质的青贮饲料，但在川西北高原地区以全株玉米和全株箭筈豌豆混贮效果更佳。

关键词: 川西北高原, 混合青贮, 发酵时间, 发酵品质