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草业学报 ›› 2023, Vol. 32 ›› Issue (5): 159-170.DOI: 10.11686/cyxb2022217

• 研究论文 • 上一篇    

不同物理形态的开食料对羔羊瘤胃转录组的影响

杨瑞鑫1(), 李勇1,2, 蔡小芳1, 韩铖星1, 郭艳丽1()   

  1. 1.甘肃农业大学动物科学技术学院,甘肃 兰州 730070
    2.河南农业职业学院牧业工程学院,河南 郑州 451450
  • 收稿日期:2022-05-18 修回日期:2022-08-31 出版日期:2023-05-20 发布日期:2023-03-20
  • 通讯作者: 郭艳丽
  • 作者简介:E-mail: guoyl@gsau.edu.cn
    杨瑞鑫(1997-),男,甘肃酒泉人,在读硕士。E-mail: yrx25478@163.com
  • 基金资助:
    国家自然科学基金项目(31860654)

Effects of starter feed in different physical forms on the rumen transcriptome of lambs

Rui-xin YANG1(), Yong LI1,2, Xiao-fang CAI1, Cheng-xing HAN1, Yan-li GUO1()   

  1. 1.College of Animal Science and Technology,Gansu Agricultural University,Lanzhou 730070,China
    2.College of Animal Husbandry Engineering,Henan Vocational College of Agriculture,Zhengzhou 451450,China
  • Received:2022-05-18 Revised:2022-08-31 Online:2023-05-20 Published:2023-03-20
  • Contact: Yan-li GUO

摘要:

开食料的物理形态会影响反刍动物的瘤胃发育。本试验的目的是通过研究颗粒化(pelleted starter, PS)和口感化开食料(textured starter, TS)对湖羊羔羊早期断奶前后瘤胃组织转录组的影响,探究开食料的物理形态对羔羊瘤胃发育影响的分子机制。将24只初生重相近[(5.04±0.75) kg]的8日龄湖羊公羔随机分到两个处理组中,每组12只,每只为1个重复,分别饲喂颗粒化和口感化开食料。羔羊从出生到7日龄吃母乳,从8日龄开始停止哺乳,饲喂代乳粉,当日开始饲喂开食料,35日龄断代乳粉。于断奶前(21日龄)、后(42日龄),每组随机选择6只羔羊屠宰,采集瘤胃腹囊组织,利用RNA-Seq技术进行转录组测序。试验结果共获得4478个差异表达基因。与PS组相比,TS组羔羊在断奶前分别有194个上调基因和293个下调基因;断奶后分别有1763个上调基因和2228个下调基因。GO注释和KEGG通路富集分析显示,差异表达基因主要富集在肽和氨基酸生物合成过程、肽代谢、碳水化合物代谢、脂质代谢、丁酸代谢、丙酮酸代谢及细胞凋亡等关键代谢通路。根据富集结果,随机选取15个差异表达基因进行qRT-PCR验证,与转录组测序结果一致。综上所述,TS上调表达与脂肪酸代谢、细胞周期蛋白和激酶、生长有关的基因,下调表达与细胞凋亡有关的基因,可能是其促进羔羊瘤胃发育的重要原因。

关键词: 颗粒化开食料, 口感化开食料, 转录组, 瘤胃, 羔羊

Abstract:

The physical form of the starter feed can affect the rumen development of ruminants. In this study, we investigated the effects of different physical forms of starter feed on the rumen transcriptome of pre- and post-weaning lambs. The overall aim was to explore the molecular mechanism by which starter feed in different physical forms affects the rumen development of lambs. Twenty-four 8-day-old male Hu lambs with similar birth weight [average, (5.04±0.75) kg body weight] were randomly assigned to two groups with 12 lambs per group. Each lamb was considered to be one replicate. The two groups were assigned to one of two dietary treatments (pelleted starter, PS; and textured starter, TS). Lambs were fed from their dams until 7 days of age and were separated from them at 8 days of age. From 8 to 35 days of age (pre-weaning), the lambs were bottle fed with milk replacer (MR) with ad libitum access to their respective starter feed. Feeding with MR was stopped at day 35. Six lambs per treatment were euthanized pre- (21 d) or post-weaning (42 d) for sampling. The abdominal sac tissue was collected from the rumen. RNA-Seq was used for transcriptome sequencing. A total of 4478 genes were differentially expressed between the two groups. Compared with the PS group, the TS group showed 194 up-regulated genes and 293 down-regulated genes pre-weaning, and 1763 up-regulated genes and 2228 down-regulated genes post-weaning. Gene ontology (GO) annotation and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses showed that the differentially expressed genes were mainly enriched in key metabolic pathways such as peptide and amino acid biosynthesis, peptide metabolism, carbohydrate metabolism, lipid metabolism, butyric acid metabolism, pyruvate metabolism, and apoptosis. According to the enrichment results, 15 differentially expressed genes were selected for verification of their expression patterns by qRT-PCR. The results obtained from the qRT-PCR analyses were consistent with those obtained from transcriptome sequencing. In conclusion, the up-regulation of genes related to fatty acid metabolism, cyclins and kinases, and growth, and down-regulation of genes related to apoptosis of the rumen epithelium of the TS group may be the important factors in promoting the rumen development of lambs.

Key words: pelleted starter, textured starter, transcriptomics, rumen, lambs