title: Ovarian transcriptomic analysis of Shan Ma ducks at peak and late stages of egg production.
abstract: OBJECTIVE
  To assess the differences in ovarian transcriptomes in Shan Ma ducks between their peak and late stages of egg production, and to obtain new transcriptomic data of these egg-producing ducks.
  
  
  METHODS
  The Illumina HiSeq 2000 system was used for high throughput sequencing of ovarian transcriptomes from Shan Ma ducks at their peak or late stages of egg production.
  
  
  RESULTS
  Greater than 93% of the sequencing data had a base quality score (Q score) that was not less than 20 (Q20). From ducks at their peak stage of egg production, 42,782,676 reads were obtained, with 4,307,499,083 bp sequenced. From ducks at their late stage of egg production, 45,316,166 reads were obtained, with 4,562,063,363 bp sequenced. A comparison of the two datasets identified 2,002 differentially expressed genes, with 790 upregulated and 1,212 downregulated. Further analysis showed that 1,645 of the 2,002 differentially expressed genes were annotated in the non-redundant (NR) database, with 646 upregulated and 999 downregulated. Among the differentially expressed genes with annotations in the NR database, 696 genes were functionally annotated in the clusters of orthologous groups of proteins database, involving 25 functional categories. One thousand two hundred four of the differentially expressed genes with annotations in the NR database were functionally annotated in the gene ontology (GO) database, and could be divided into three domains and 56 categories. The three domains were cellular component, molecular function, and biological process. Among the genes identified in the GO database, 451 are involved in development and reproduction. Analysis of the differentially expressed genes with annotations in the NR database against the Kyoto encyclopedia of genes and genomes database revealed that 446 of the genes could be assigned to 175 metabolic pathways, of which the peroxisome proliferator-activated receptor signaling pathway, insulin signaling pathway, fructose and mannose metabolic pathways, gonadotropin releasing hormone signaling pathway and transforming growth factor beta signaling pathway were significantly enriched.
  
  
  CONCLUSIONS
  The differences in ovarian transcriptomes in Shan Ma ducks between their peak and late stages of egg production were elucidated, which greatly enriched the ovarian transcriptomic information of egg-producing ducks.
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: ZhiMing
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: ZhongWei
authors.initials: Z
authors.lastname: Miao
authors.affiliation: Longyan Original Breeder's Farm of Shan Ma Duck, LongYan 364000, China.
authors.forename: HongPing
authors.initials: H
authors.lastname: Chen
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: QingWu
authors.initials: Q
authors.lastname: Xin
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: Longyan Original Breeder's Farm of Shan Ma Duck, LongYan 364000, China.
authors.forename: RuLong
authors.initials: R
authors.lastname: Lin
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: QinLou
authors.initials: Q
authors.lastname: Huang
authors.affiliation: Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China.
authors.forename: NenZhu
authors.initials: N
authors.lastname: Zheng
keywords: Differentially Expressed Genes; Ovary; Shan Ma Ducks; Transcriptome