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Pubmed ID :30025296
Publication Date : //

Effect of dietary energy restriction and subsequent compensatory feeding on testicular transcriptome in developing rams.


Nutritional intake and reproductive allocation are strongly associated and dietary energy restriction (ER) or surpluses can affect reproductive capacity. The objective of this study was to investigate the effect of energy levels on sheep testicular development. Three-month old Hu sheep were assigned to four groups, and fed diets containing different levels of energy (Control, maintenance energy; ER1, 85% maintenance energy; ER2, 70% maintenance energy; ER3, 55% maintenance energy). Two months later, half the sheep in each group were euthanized, whereas the remaining sheep were euthanized after a further 3 months feeding on a compensatory energy diet. The testicular weight and reproductive hormone levels of the Hu sheep were investigated. Differences in the testes of ER3 and control group sheep were investigated at the transcriptional level using high-throughput sequencing. The results showed that the testicular weights had decreased in the energy-restricted rams compared with the controls, and that the testosterone concentration in ER3 group rams was significantly lower than that in other compared groups (P < 0.05). After the period of compensatory feeding, however, ER3 sheep testicular weight and testosterone concentrations were similar to those of the control group sheep. In addition, the RNA sequencing results revealed that 81 genes were upregulated and 180 genes were downregulated in the ER3 group compared with the control group. Moreover, based on the enriched steroidogenesis, meiosis and kinases pathways, a number of candidate genes potentially involved in the regulation of testicular development or reproduction of Hu sheep, including CYP11A1, ALDH3B1, FDFT1, WNT2, PGR and INSR, were screened. Quantitative real-time polymerase chain reaction analysis results correlated well with the sequencing data. Taken together, this study provides a first insight into the development of the testis with dietary energy restriction in sheep and shows that these changes are associated with alterations in transcriptomic. The sheep testis mRNA database were extended in this study will provides novel candidate regulators for future genetic and molecular studies on sheep testicular development associated with energy restriction, which will contribute to improving the reproductive performance of sheep.

Authors : Fan Y X , Wang Z , Ren C F , Ma T W , Deng K P , Feng X , Li F Z , Wang F , Zhang Y L ,

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