The fermentation quality of mixed silages of hulless barley (Hordeum vulgare) straw and perennial ryegrass (Lolium perenne) was studied using the following treatments: control (100% hulless barley straw), L (80% hulless barley straw+20% perennial ryegrass), M (60% hulless barley straw+ 40% perennial ryegrass) and H (40% hulless barley straw+60% perennial ryegrass). The laboratory silos were opened on 7, 14 and 30 days after ensiling in triplicate and the fermentation quality was measured. The mixed silages significantly (P<0. 05) increased lactic acid and water soluble carbohydrate contents, while significantly (P<0. 05) reducing pH value and dry matter content. Acetic acid content was significantly (P<0. 05) increased with an increase of perennial ryegrass in mixed silages. The ammonia/total nitrogen of mixed silages was lower (P> 0. 05) than that of the control. There was little butyric or propionic acids in all silages. Based on these results, mixed silage of 40% perennial ryegrass was best for improving the fermentation quality of hulless barley straw.%本研究旨在将青稞秸秆与黑麦草以不同比例混合青贮,评价其发酵品质,筛选出适宜的混合比例.试验设青稞秸秆单独青贮(对照组)、80％青稞秸秆+20％多年生黑麦草混贮(L组)、60％青稞秸秆+40％多年生黑麦草混贮(M组)及40％青稞秸秆+60％多年生黑麦草混贮(H组)4个处理.青贮后第7,14和30天后打开青贮窖,测定青贮饲料发酵品质.结果表明,青稞秸秆与黑麦草混合青贮显著(P＜0.05)提高了乳酸和水溶性碳水化合物含量,显著(P＜0.05)降低了pH值和干物质含量,M和H组在乳酸产生的同时乙酸含量显著(P＜0.05)提高,混贮组氨态氮/总氮略低于对照组(P＞0.05),各组均显示较低的丙酸和丁酸含量.从秸秆利用最大化的角度出发,建议以40％黑麦草混合青贮较为适宜.
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