ArticlePoultry science2026
Photocycle driven lipid metabolism in Muscovy duck liver: A process mediated by the PPAR pathway.
Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The photoperiod is a key environmental factor regulating energy metabolism and growth in poultry, but its impact on the liver of Muscovy ducks is not yet clear. The aim of this study is to elucidate the effects of different photoperiods on the metabolism of Muscovy duck liver, and to reveal its molecular mechanisms from the perspectives of hormone regulation and RNA-sequencing (RNA-seq). The experiment set up a start egg laying group (S group, 6L: 18D) and the peak period of egg production group (P group, 14L: 10D), and collected serum and liver tissue samples for analysis. Through enzyme-linked immunosorbent assay, it was found that compared with the S group, long light treatment significantly increased the concentration of insulin-like growth factor-1 (IGF-1) in the liver and triggered unique lipid distribution characteristics: serum triglyceride (TG) levels increased while liver TG content significantly decreased. RNA-seq analysis showed significant enrichment of the peroxisome proliferator activated receptor (PPAR) signaling pathway. Further mechanistic studies have shown that prolonged exposure to light can selectively activate the PPAR β pathway and inhibit the PPAR γ pathway. Research has indicated that that prolonged exposure to light promotes the expression of IGF-1 in the liver by activating the hypothalamic pituitary growth axis, which in turn regulates liver metabolism from lipid storage to lipid turnover and output through the PPAR signaling pathway. This may be a key molecular basis for mediating lipid redistribution between serum and liver. This discovery not only deepens our understanding of the mechanism by which light regulates energy metabolism in poultry, but also provides an important theoretical basis for improving the production performance and meat quality of Muscovy ducks through precise light management.
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