RDP相同NFC及硫水平不同的日粮对人工奶牛瘤胃发酵影响

发布时间：2018-02-03 05:16

本文关键词： 体外发酵瘤胃降解蛋白非结构性碳水化合物硫比例　出处：《饲料工业》2017年07期 　论文类型：期刊论文

【摘要】：文章研究的目的是瘤胃降解蛋白(RDP)相同,非结构性碳水化合物(NFC)及硫水平不同的日粮对人工奶牛瘤胃发酵的影响。试验选择3头健康的荷斯坦奶牛提供瘤胃液,试验采用双因素试验设计[3×4:NFC与RDP比值分别为3.35、4和4.8,硫(S)的水平分别为0.15%、0.20%、0.25%和0.30%],试验结果表明,不同NFC/RDP水平的日粮体外发酵,pH值(2 h除外)、产气量、丙酸、丁酸、菌体蛋白(MCP)差异显著(P0.05);NH_3-N浓度在8、12 h和24 h差异显著(P0.05);乙酸在2、4、8 h和12 h差异显著(P0.05);干物质降解率(DMD)在2、4、8 h和24 h差异显著(P0.05)。硫对pH值和NH_3-N浓度在12 h和24 h的影响显著(P0.05),而且产气量、丙酸、丁酸和菌体蛋白含量也有明显的影响(P0.05);但对乙酸浓度的影响不显著。总的来说,当NFC/RDP值为4时,瘤胃pH值、产气量、乙酸、微生物粗蛋白含量和干物质降解率(DMD)增加,但NH_3-N、丙酸和丁酸浓度降低,适当的补充硫(硫含量为0.25%),瘤胃pH值、产气量、丙酸、丁酸、MCP含量会增加,然而NH_3-N浓度降低,同时两者之间存在这交互作用。综合各项指标表明日粮NFC/RDP值为4、硫水平为0.25%的日粮可明显改善瘤胃内环境、促进瘤胃发酵提高饲料各成分的降解率。
[Abstract]:The aim of this study was to identify the same rumen degrading protein (RDP). Effects of diets with different levels of non-structural carbohydrate (NFC) and sulfur on rumen fermentation of artificial cows. Three healthy Holstein cows were selected to provide rumen fluid. [The ratio of 3 脳 4: NFC to RDP is 3.35% and 4.8, respectively, and the level of sulfur is 0.15% and 0.20% and 0.30%, respectively. The experimental results show that the ratio of 3 脳 4: NFC to RDP is 3.35% and 4.8%, respectively. With the exception of pH value 2 h, the difference of gas production, propionic acid, butyric acid and mycelium protein in different NFC/RDP levels was significant (P 0.05). The concentration of NH_3-N was significantly different from that of P0.05 at 8 h and 24 h. The difference of acetic acid between 8 h and 12 h was significant (P 0.05). The degradation rate of dry matter (DMD) was 2 ~ (4). The effect of sulfur on pH value and NH_3-N concentration at 12 h and 24 h was significantly different from that at 8 h and 24 h, and the gas production and propionic acid were also significant. The contents of butyric acid and bacterial protein also had a significant effect on P0.05; In general, when NFC/RDP was 4:00, rumen pH, gas production, acetic acid, microbial crude protein content and dry matter degradation rate increased. However, the concentration of NH3-N, propionic acid and butyric acid decreased, and the appropriate supplementation of sulfur (sulfur content was 0.25%, rumen pH value, gas production, propionic acid, butyric acid MCP content increased. However, the concentration of NH_3-N decreased and there was this interaction between the two. The combined indexes showed that the dietary NFC/RDP value was 4. The diet with sulfur level of 0.25% could obviously improve the rumen environment and promote rumen fermentation to increase the degradation rate of feed components.
【作者单位】：东北农业大学动物科学技术学院;
【分类号】：S823.5
【正文快照】： 粗蛋白(CP)是反刍动物的重要营养物质之一,主与硫含量之间也会有相互作用共同影响瘤胃内环境,要包括瘤胃降解蛋白(RDP)和过瘤胃蛋白(NFC)。其本试验设计研究的总体目标是在满足动物营养需要中瘤胃降解蛋白有利于瘤胃微生物的生长,而微生物量的前提下,按照NRC营养标准,通过人工

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