Transcriptomic analysis reveals the molecular mechanisms of rumen wall morphological and functional development induced by different solid diet introduction in a lamb model  

作　　者：Daming Sun Yuyang Yin Changzheng Guo Lixiang Liu Shengyong Mao Weiyun Zhu Junhua Liu 

机构地区：[1]Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health,Laboratory of Gastrointestinal Microbiology,College of Animal Science and Technology,Nanjing Agricultural University,Nanjing 210095,Jiangsu Province,China [2]National Center for International Research on Animal Gut Nutrition,Nanjing Agricultural University,Nanjing 210095,China [3]National Experimental Teaching Demonstration Center of Animal Science,Nanjing Agricultural University,Nanjing 210095,China [4]Huzhou Academy of Agricultural Sciences,Huzhou 313000,China

出　　处：《Journal of Animal Science and Biotechnology》2021年第3期1169-1183,共15页畜牧与生物技术杂志（英文版）

基　　金：This work was supported by the Project for Top Young Talents Program of College of Animal Science and Technology of Nanjing Agricultural University(DKQB201904);National Key Research and Development Plan(2018YFD0501900);Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX20_0603);Science and Technology Project of Huzhou City of China(2017GY18).

摘　　要：Background:This study aimed to elucidate the molecular mechanisms of solid diet introduction initiating the cellular growth and maturation of rumen tissues and characterize the shared and unique biological processes upon different solid diet regimes.Methods:Twenty-four Hu lambs were randomly allocated to three groups fed following diets:goat milk powder only(M,n=8),goat milk powder+alfalfa hay(MH,n=8),and goat milk powder+concentrate starter(MC,n=8).At 42 days of age,the lambs were slaughtered.Ruminal fluid sample was collected for analysis of concentration of volatile fatty acid(VFA)and microbial crude protein(MCP).The sample of the rumen wall from the ventral sac was collected for analysis of rumen papilla morphology and transcriptomics.Results:Compared with the M group,MH and MC group had a higher concentration of VFA,MCP,rumen weight,and rumen papilla area.The transcriptomic results of rumen wall showed that there were 312 shared differentially expressed genes(DEGs)between in“MH vs.M”and“MC vs.M”,and 232 or 796 unique DEGs observed in“MH vs.M”or“MC vs.M”,respectively.The shared DEGs were most enriched in VFA absorption and metabolism,such as peroxisome proliferator-activated receptor(PPAR)signaling pathway,butanoate metabolism,and synthesis and degradation of ketone bodies.Additionally,a weighted gene co-expression network analysis identified M16(2,052 genes)and M18(579 genes)modules were positively correlated with VFA and rumen wall morphology.The M16 module was mainly related to metabolism pathway,while the M18 module was mainly associated with signaling transport.Moreover,hay specifically depressed expression of genes involved in cytokine production,immune response,and immunocyte activation,and concentrate starter mainly altered nutrient transport and metabolism,especially ion transport,amino acid,and fatty acid metabolism.Conclusions:The energy production during VFA metabolism may drive the rumen wall development directly.The hay introduction facilitated establishment of immune function,wh

关 键 词：CONCENTRATE HAY LAMB Rumen development TRANSCRIPTOME 

分 类 号：S826.5[农业科学—畜牧学]