川西北高寒牧区老芒麦和虉草青贮效果初步研究

摘要

The effects of additives on cultivated grass silage (Elymussibiricns L. And Phalarisarundinacea L. ) from alpine meadow in northwest Sichuan grassland were studied and the numbers of adhesive microbe were analyzed. Cellulase, sucrose, urea and acetic acid were tested additives. Results showed that the numbers of lactic acid bacteria were less than that of molds, yeast and butyric acid bacteria in silage. Sucrose and urea improved the fermentation quality of both forages. Lactic acid and ammonia nitrogen/total nitrogen (AN/TN) were significantly lower than that of control (P<0. 05). Acetic acid improved the fermentation quality of both forages in which pH and AN/TN were significantly lower and acetic acid (AA) was higher than control group (P<0. 05). Cellulase did not improve fermentation quality and chemical composition of Phalaris arundinacea L. Significantly.%为探讨川西北高寒牧区主推草种青贮效果,以收种后的老芒麦(Elymus sibiricns L.)和祷草(Phalaris arundinacea L.)为原料,对其叶围微生物进行计数,使用纤维素酶、蔗糖、尿素和乙酸作为添加剂,灌装青贮60 d后进行品质分析.结果表明:老芒麦和虉草附着的乳酸菌数量远低于霉菌、酵母菌和丁酸菌；蔗糖和尿素处理下,乳酸含量显著高于对照,氨态氮与总氮比值显著低于对照(P＜0.05),能够改善老芒麦青贮饲料和祷草青贮饲料发酵品质；乙酸处理下,pH值、氨态氮与总氮比值显著低于对照,乙酸含量显著高于对照(P＜0.05),能够改善老芒麦青贮饲料和祷草青贮饲料的发酵品质；纤维素酶对改善祷草青贮饲料发酵品质无显著影响.