复合有机酸对杂交狼尾草青贮品质、有氧稳定性及微生物数量的影响

Effects of composite organic acids on silage quality,aerobic stability,and microbial population of hybrid Pennisetum alopecuroides(L.)Spreng

试验旨在探究不同比例的复合有机酸对杂交狼尾草青贮品质、有氧稳定性及微生物数量的影响。试验分为4组,每组5个重复,对照组和各试验组复合有机酸的添加量分别为0、0.5%、1.0%和2.0%。青贮60 d。结果显示:与对照组相比,1.0%复合有机酸组的干物质、粗蛋白、可溶性碳水化合物含量和相对饲喂价值显著增加(P<0.05),中性洗涤纤维含量显著降低(P<0.05),1.0%、2.0%复合有机酸组的酸性洗涤纤维含量显著降低(P<0.05),0.5%和1.0%复合有机酸组的粗灰分含量显著降低(P<0.05);1.0%和2.0%复合有机酸组的pH值、氨态氮/总氮的比值显著降低(P<0.05),1.0%复合有机酸组的乳酸含量显著升高(P<0.05),0.5%复合有机酸组的乙酸含量显著增加(P<0.05),1.0%和2.0%复合有机酸组的乙酸含量显著降低(P<0.05),1.0%复合有机酸组的丙酸含量显著增加(P<0.05),0.5%、1.0%和2.0%复合有机酸组的丁酸含量显著降低(P<0.05)。与对照组相比,0.5%和1.0%复合有机酸组的有氧稳定性和乳酸菌数量显著增加(P<0.05),1.0%和2.0%复合有机酸组的酵母菌数量显著降低(P<0.05),0.5%、1.0%和2.0%复合有机酸组的好氧菌数量显著降低(P<0.05)。研究表明,青贮过程中添加复合有机酸可以改善杂交狼尾草的营养价值和发酵品质,以1.0%复合有机酸组效果较好。

The experiment aimed to explore the effects of different ratios of composite organic acids on the silage quality,aerobic stability,and microbial population of hybrid Pennisetum alopecuroides(L.)Spreng.The experiment was divided into four groups,with five replicates in each group.The addition amounts of compound organic acids in control group and experimental groups were 0,0.5%,1.0%and 2.0%,respectively.The silage was stored for 60 days.The results showed that compared with the control group,the dry matter,crude protein,soluble carbohydrate content,and relative feeding value of the 1.0%composite organic acid group were significantly increased(P<0.05),the content of neutral detergent fiber was significantly reduced(P<0.05),the acid detergent fiber content of the 1.0%and 2.0%composite organic acid groups was significantly reduced(P<0.05),and the ash content of the 0.5%and 1.0%composite organic acid groups was significantly reduced(P<0.05).The pH value and the ratio of ammonia nitrogen to total nitrogen of the 1.0%and 2.0%composite organic acid groups were significantly reduced(P<0.05),the lactic acid content of the 1.0%composite organic acid group was significantly increased(P<0.05),the acetic acid content of the 0.5%composite organic acid group was significantly increased(P<0.05),the acetic acid content of the 1.0%and 2.0%composite organic acid groups was significantly reduced(P<0.05),and the propionic acid content of the 1.0%composite organic acid group was significantly increased(P<0.05),and the butyric acid content of the 0.5%,1.0%,and 2.0%composite organic acid groups was significantly reduced(P<0.05).Compared with the control group,the aerobic stability and lactic acid bacteria count of the 0.5%and 1.0%composite organic acid groups were significantly increased(P<0.05),the yeast count of the 1.0%and 2.0%composite organic acid groups was significantly reduced(P<0.05),and the aerobic bacteria count of the 0.5%,1.0%,and 2.0%composite organic acid groups was significantly reduced(P<0.05).The study shows that adding composite organic acids during the silage process can improve the nutritional value and fermentation quality of hybrid Pennisetum alopecuroides(L.)Spreng,with the 1.0%composite organic acid group showing the best results.