草业学报2016，Vol.25Issue(4)：188-196,9.DOI:10.11686/cyxb2015271
混贮模式对高丹草青贮发酵品质及体外产气动力学特性的影响
Effects of mixed silage modes on the fermentation quality and in vitro gas dynamics of a sorghum-sudangrass hybrid (Sorghum bicolor ×Sorghum sudanense)
摘要
Abstract
The fermentation quality of sorghum-sudangrass hybrids (Sorghum bicolor ×Sorghum sudanense )is poor because of their high moisture contents.In this study,we analyzed the effects of different storage modes on the fermentation quality of a sorghum-sudangrass hybrid.A sorghum-sudangrass hybrid was mixed different types of hay (corn stalk,wheat straw,and alfalfa hay)at different proportions (12.5,25.0,37.5 and 50.0 kg/t).Then,the nutritive value,fermentation quality,72 h dry matter digestibility,and gas dynamics were measured using an in vitro system that simulated rumen fermentation.The results showed that the silage pro-duced from the sorghum-sudangrass hybrid had a high butyric acid content,and a poor Flieg evaluation rank-ing.The addition of all types of hay significantly improved the fermentation quality of stored silage.The addi-tion of wheat straw resulted in the best fermentation quality,while the addition of alfalfa hay resulted in the best nutritive value.The addition of alfalfa hay resulted in the highest values for IVDMD (in vitro dry matter digestibility),c (gas production speed),and AGPR (speed when gas production was one-half of the maxi-mum).There was no significant difference in GP72h (accumulated gas production in 72 h),A (ideal maximum gas production),and lag (lag time of gas production)among silages produced with the three types of hay.In terms of the amount of hay added,the addition of 25.0 kg/t resulted in the best fermentation quality and the highest half-time content,and the addition of 50.0 kg/t resulted in the best nutritive value and the highest IVDMD.The addition of 37.5 kg/t hay resulted in the highest c and AGPR values.The amount of hay added did not significantly affect GP72h ,A,or lag .Considering the nutritive value and fermentation quality,the best mixed silage was produced by adding 37.5 kg/t wheat straw.The addition of 50.0 kg/t alfalfa hay gave the highest IVDMD content,the addition of 37.5 kg/t alfalfa hay gave the highest gas production rate,and the ad-dition of 50.0 kg/t wheat straw resulted in the highest GP72h and A.关键词
高丹草/混合青贮/营养价值/青贮发酵品质/体外产气动力学特性Key words
sorghum-sudangrass hybrids/mixed silage/nutritive value/fermentation quality/in vitro ruminal fermentation引用本文复制引用
梁欢,刘贵波,吴佳海,曾兵,李源,游永亮,赵海明..混贮模式对高丹草青贮发酵品质及体外产气动力学特性的影响[J].草业学报,2016,25(4):188-196,9.基金项目
西南大学荣昌校区青年基金项目（20700431），现代农业产业技术体系建设项目（CARS-35-24），贵州山区牧草产业化生产技术研究集成与应用［黔科合重大专项字（2014）6017号］和重庆市山羊产业技术体系优质牧草种植研究室建设项目资助。 （）
