复合缓冲剂对奶山羊乳成分、血浆生化指标及激素含量的影响

发布时间：2018-02-03 07:34

本文关键词： 复合缓冲剂高精料奶山羊乳品质胰岛素　出处：《动物营养学报》2017年07期 　论文类型：期刊论文

【摘要】：本试验旨在研究长期饲喂高精料饲粮下添加复合缓冲剂(碳酸氢钠20 g/d、氧化镁12 g/d、丁酸钠20 g/d)对奶山羊乳成分、血浆生化指标及激素含量的影响。选择8头安装门静脉及肝静脉瘘管处于泌乳中期的奶山羊随机分为2组,分别饲喂基础饲粮(高精料饲粮组,HG组)和基础饲粮+复合缓冲剂(高精料饲粮+复合缓冲剂组,BG组)。预试期为7 d,正试期为143 d。结果显示:与HG组相比,复合缓冲剂显著升高采食后010 h瘤胃液p H平均值(P0.05);复合缓冲剂显著降低肝静脉血浆中非酯化脂肪酸的含量(P0.05),对门静脉和肝静脉血浆中葡萄糖、β-羟丁酸含量无显著影响(P0.05),对肝脏组织中甘油三酯和总蛋白含量无显著影响(P0.05);复合缓冲剂显著降低门静脉血浆中胰岛素和胰高血糖素的含量(P0.05),对门静脉和肝静脉血浆中胰岛素样生长因子1和生长激素的含量无显著影响(P0.05);复合缓冲剂显著或极显著升高产奶量、乳脂率、乳蛋白率、乳非脂固形物率(P0.05或P0.01)。综合得出,在长期高精料饲粮饲喂条件下,由碳酸氢钠、氧化镁、丁酸钠组成的复合缓冲剂能通过影响奶山羊血浆生化指标及激素含量,影响体机营养物质代谢,最终有效提高产乳量与改善乳品质。
[Abstract]:The aim of this study was to study the effects of compound buffer (sodium bicarbonate 20 g / d, magnesium oxide 12 g / d, sodium butyrate 20 g / d) on milk composition of dairy goats fed with high concentrate diet for a long time. 8 dairy goats with portal vein and hepatic vein fistula in the middle lactation were randomly divided into two groups and fed with basic diet (high concentrate diet group). HG group and basic diet compound buffer group (high concentrate diet compound buffer group). The pretest period was 7 days and the positive test period was 143 days. The results showed that compared with HG group. The mean value of pH in rumen fluid was significantly increased by compound buffer at 010 h after feeding (P 0.05). The compound buffer significantly reduced the content of non-esterified fatty acids in hepatic vein plasma (P0.05), but had no significant effect on the contents of glucose and 尾 -hydroxybutyric acid in portal vein and hepatic vein plasma (P0.05). There was no significant effect on the content of triglyceride and total protein in liver tissue. Compound buffer significantly decreased the contents of insulin and glucagon in portal vein plasma (P 0.05). The contents of insulin-like growth factor 1 and growth hormone in portal vein and hepatic vein plasma were not significantly affected by P0.05A; Compound buffers significantly or extremely significantly increased milk yield, milk fat rate, milk protein rate, milk non-fat solid rate (P 0.05 or P 0.01). The compound buffer composed of sodium bicarbonate, magnesium oxide and sodium butyrate can affect the metabolism of nutrients by affecting the plasma biochemical indexes and hormone content of dairy goats, and improve milk yield and milk quality effectively.
【作者单位】：南京农业大学动物科技学院;
【基金】：国家重点基础研究发展计划奶业(973)项目(2011CB100802)
【分类号】：S827.5
【正文快照】： 在我国奶业生产中,由于缺乏优质的粗饲料源,养殖者为了获得高产量及经济效益,通常给动物饲喂高精料饲粮。然而,当反刍动物饲喂高精料饲粮后则会导致瘤胃液p H降低,体内代谢异常,最终使生产能力下降、乳品质下降[1]。毫无疑问,产奶性能下降的过程也必定伴随着生化指标的改变和

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