代乳粉对早期断奶沂蒙黑山羊羔小肠发育、菌群多样性及葡萄糖转运载体基因表达的影响

doi:10.3864/j.issn.0578-1752.2018.11.016

摘要/Abstract

摘要： 【目的】研究饲喂代乳粉对早期断奶沂蒙黑山羊羔小肠发育、菌群多样性及葡萄糖转运载体基因表达的影响，为沂蒙黑山羊早期断奶羔羊的培育提供理论依据。【方法】将36只双胎沂蒙黑山羊羔羊分成2组，每组6个重复，每个重复3只。其中，对照组(Ⅰ组)羔羊随母哺乳至75日龄，试验组(Ⅱ组)于10日龄断奶后饲喂代乳粉。分别于试验的第10、15、25、45和75 天称羔羊活体重以及屠宰后十二指肠、空肠、回肠重量，并收集各肠段内容物、黏膜组织样品。采用16S rDNA的PCR-DGGE技术和实时荧光定量PCR等方法，分析小肠菌群定植规律及葡萄糖转运载体(SGLT-1、GLUT-2)基因mRNA表达量。【结果】Ⅱ组羔羊45 d时平均日增重和空肠、回肠重量显著高于Ⅰ组(P＜0.05)，而75 d时平均日增重和回肠重量极显著高于Ⅰ组(P＜0.01)。十二指肠在45和75 d、空肠在15 d及回肠在10 d时两组间菌群变化较为明显，二者菌群多样性指数回肠最高，其次空肠、十二指肠；两组各肠段优势菌群均为溶淀粉乳杆菌和普雷沃氏菌属，但随着日龄增加，Ⅰ组各肠段益生菌属总细菌数量呈下降趋势，Ⅱ组却与此相反。Ⅱ组在10 d时SGLT-1和GLUT-2基因mRNA表达量最低，而25 d后Ⅱ组表达量均高于Ⅰ组，且差异不显著(P＞0.05)；上述基因表达量呈现肠段部位间差异，其中SGLT-1基因mRNA表达量变化空肠最大，十二指肠最低，而GLUT-2基因mRNA表达量变化十二指肠最大，回肠最低。【结论】饲喂代乳粉在第25 天时可促进沂蒙黑山羊早期断奶羔羊空肠、回肠有益菌提前定植，并通过调控葡萄糖转运载体基因表达而引起葡萄糖吸收转运的改变，进而影响羔羊后期肠道组织及机体的生长发育。

关键词: 代乳粉, 肠道菌群, 葡萄糖转运载体, 沂蒙黑山羊

Abstract: 【Objective】 Thisstudy was conducted to evaluate the effects of the milk replacer on the intestinal development, the flora diversity and the relative expression of glucose transporter gene of Yimeng black goat lambs in order to provide theoretical basis for the cultivation of early stage Yimeng black goat lambs. 【Method】 A total of 36 twin born Yimeng black goat lambs were randomly divided into 2 groups, each with 6 replicates and each replicate 3 lambs. The lambs in the control group (group I) were fed with breast milk for 75 days, while the lambs in the experimental group (group II) were weaned on the 10th day and fed with milk replacer thereafter. The weight of duodenum, jejunum, ileum as well as live body of the lambs in the two groups were recorded on the 10, 15, 25, 45 and 75th day, and meanwhile, the small intestinal contents and mucous tissue samples were collected. The colonization of small intestinal flora and the expression of glucose transporter (SGLT-1, GLUT-2) gene mRNA were analyzed by the PCR-DGGE of 16S rDNA and real-time fluorescence quantitative PCR, respectively. 【Result】 The results showed that the average daily gain and the weight of jejunum and ileum of the lambs in group II on the 45th day were significantly higher than those in group I (P＜0.05), while on the 75th day, the average daily gain and ileum weight of the lambs in group II were highly significantly higher than those in group I (P＜0.01). The flora distribution difference between group I and group II was significant in the duodenum on the 45 and 75th day, in the jejunum on the 15th day and in the ileum on the 10th day. The flora diversity in the ileum was higher than that in the jejunum and duodenum, and the microbiota diversity in the jejunum was higher than that in the duodenum. The bacterium lacticum dissolving starch and prevotella were dominant bacteria in the whole intestinal tract of Group I and II. The number of probiotics in group I decreased with the growth of age, while an opposite dynamic was found in the group II. The expression of SGLT-1 and GLUT-2 genes in the group II was the lowest at the 10 d, but their expression increased on the 25th day, meanwhile the two genes took on different expression profiles in different intestinal segments. The fluctuation of expression level of SGLT-1 was the highest and lowest in the jejunum and duodenum, respectively, while that of GLUT-2 was the biggest and lowest in the duodenum and ileum, respectively.【Conclusion】 In conclusion, feeding milk replacer could promote early colonization of probiotics in the jejunum and ileum of early weaned Yimeng black goat lambs on the 25th day and the glucose absorption and transport could be changed by regulating glucose transporter gene expression, which further affected later development of intestinal tissue and the growth of the lambs.

Key words: milk replacer, intestinal flora, glucose transporter, Yimeng black goat

李永洙，金太花，韩照清，夏春峰，晁洪雨，张乃锋，王世琴，刁其玉. 代乳粉对早期断奶沂蒙黑山羊羔小肠发育、菌群多样性及葡萄糖转运载体基因表达的影响[J]. 中国农业科学, 2018, 51(11): 2193-2205.

LI YongZhu,JIN TaiHua, HAN ZhaoQing, XIA ChunFeng, CHAO HongYu, ZHANG NaiFeng, WANG ShiQin, DIAO QiYu. Effects of the Milk Replacer on the Development of Intestine, the Flora Diversity and the Relative Expression of Glucose Transporter Gene of Early Weaned Yimeng Black Goat Lambs[J]. Scientia Agricultura Sinica, 2018, 51(11): 2193-2205.

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