西藏地区不同作物秸秆体外发酵特性研究

发布时间：2018-05-11 11:41

本文选题：西藏 + 作物秸秆　；参考：《动物营养学报》2017年02期

【摘要】：本试验旨在利用体外产气法评定西藏地区不同作物秸秆的营养价值。选取西藏地区5种常见作物秸秆(豌豆秸秆、玉米秸秆、青稞秸秆、小麦秸秆、油菜秸秆),通过单因素试验设计,利用体外产气法评定5种作物秸秆体外发酵48 h的产气量、理论最大产气量(Vf)、甲烷(CH4)产量、逻辑斯谛-指数(LE)模型产气参数、发酵液p H和氨态氮(NH3-N)浓度、主要挥发性脂肪酸(VFA)产量、体外干物质降解率(IVDMD)和体外中性洗涤纤维降解率(IVNDFD)等指标。结果显示:5种作物秸秆体外发酵48 h的产气量按玉米秸秆、青稞秸秆、豌豆秸秆、小麦秸秆、油菜秸秆的顺序依次降低。体外发酵48 h后,玉米秸秆的Vf、IVDMD、IVNDFD、CH4产量(豌豆秸秆除外)、丙酸和总VFA产量均显著高于其他4种作物秸秆(P0.05),其体外发酵液p H则显著低于其他秸秆(P0.05)。结果表明,玉米秸秆体外发酵效果最佳,与其他试验作物秸秆相比更容易被瘤胃微生物降解利用。
[Abstract]:The aim of this study was to evaluate the nutritional value of different crop stalks in Tibet by gas production in vitro. Five common crops straw (pea straw, corn straw, highland barley straw, wheat straw and rape straw) were selected in Tibet. The theoretical maximum gas production (VfN), methane CH4 (Ch _ 4) production, the gas production parameters of the logicity-index (LEL) model, the concentration of pH and NH _ 3-N in fermentation broth, the main volatile fatty acids (VFAs), The degradation rate of dry matter in vitro was higher than that of IVDMD and the degradation rate of neutral detergent fiber was higher than that of IVNDFDD in vitro. The results showed that the gas production of straw of 5 crops decreased in order of corn straw, highland barley straw, pea straw, wheat straw and rape straw in 48 h fermentation in vitro. After in vitro fermentation for 48 h, the yield of VfN IVDMDIVNDFDCH4 (except pea straw), the yield of propionic acid and total VFA were significantly higher than that of the other four crop straws, and the pH of the fermentation broth in vitro was significantly lower than that of other straws. The results showed that corn straw fermentation was the best in vitro, and it was easier to be degraded by rumen than that of other experimental crops.
【作者单位】：西藏自治区农牧科学院畜牧兽医研究所;湖南农业大学动物科学技术学院;中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室湖南省畜禽健康养殖工程技术中心农业部中南动物营养与饲料科学观测实验站;湖南畜禽安全生产协同创新中心;
【基金】：娟姗牛生产性能与乳品质提升营养调控关键技术研究(西藏自治区财政专项)
【分类号】：S816

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