不同发酵剂对高水分‘热研4号’王草青贮品质的影响

Effects of different additives on ensilage quality ‘Reyan No. 4’king grass with high moisture content

为探究在高水分发酵条件下,不同发酵剂对‘热研4号’王草青贮品质的影响,试验设置3个处理组(A组、B组、C组)和对照组(CK),每组3个重复,发酵90 d后取样分析。结果表明:各处理组的干物质含量与CK组无显著区别,各处理组的粗蛋白质、粗脂肪、粗灰分、木质素、中性洗涤纤维、酸性洗涤纤维、P含量均低于CK组,各处理组的Ca含量均高于CK组,C组可溶性碳水化合物含量最高,各处理组的所有饲喂价值指标均高于CK组。经发酵剂处理后,A组pH最低,C组氨态氮/总氮最低,各处理组的乳酸含量均低于CK组,乙酸含量均比CK组高,C组的丁酸含量最高。对发酵品质进行综合评分可得,各处理组得分均低于CK组。利用平均隶属函数值对王草青贮品质进行综合比较,B组的青贮品质最佳。综上,添加微生物发酵剂能一定程度改善王草的营养品质,除C组外,A组、B组的青贮品质也均能得到改善,但不能提高其发酵品质,仍需进一步开展发酵剂的筛选,以更好推进高水分王草的青贮饲料化利用。

The purpose of this experiment was to explore the effects of different additives on ensilage quality‘Reyan No.4’king grass with high moisture content.Three treatment groups(group A,group B,group C)and control group(CK)were set up with 3 replicates in each group.Samples were analyzed after 90 days of fermentation.The results showed that the dry matter content of each treatment group was not significantly different from that of CK group.The contents of crude protein,crude fat,crude ash,lignin,neutral detergent fiber,acid detergent fiber and P in all treatment groups were lower than those in CK group.The content of Ca in all treatment groups were higher than that in CK group,the content of soluble carbohydrate in group C was the highest,and all feeding value indexes in all treatment groups were higher than those in CK group.After being treated with additives,pH of group A was the lowest,ammonia nitrogen/total nitrogen of group C was the lowest.Lactic acid content of all treatment groups were lower than that of CK group,acetic acid content were higher than that of CK group,and butyric acid content of C group was the highest.According to the comprehensive score of fermentation quality,the score of each treatment group was lower than that of CK group.By using the average membership function value to compare the silage quality of each treatment and CK group,group B had the best silage quality.In conclusion,adding microbial additive can improve the nutritional quality of king grass to a certain extent.The silage quality of group A and group B can also be improved except group C,but the fermentation quality cannot be improved.The selection of additives still need further research in order to better promote the silage utilization of high moisture king grass.