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Métayer-Coustard, Sonia; Tesseraud, Sophie; Praud, Christophe; Royer, David; Bordeau, Thierry; Coudert, Edouard; Cailleau-Audouin, Estelle; Godet, Estelle; Delaveau, Joël; Le Bihan-Duval, Elisabeth; Berri, Cécile
Frontiers in physiology, 03/2021, Letnik: 12, Številka: 643580Journal Article
In chickens, a divergent selection on the pHu allowed the creation of the pHu+ and pHu- lines, which represent a unique model for studying the biological control of carbohydrate storage in muscle. The present study aimed to describe the early mechanisms involved in the establishment of pHu+ and pHu- phenotypes. At hatching, pHu+ chicks were slightly heavier but exhibited lower plasma glucose and triglyceride and higher uric acid. After 5 days, pHu+ chicks exhibited higher breast meat yield compared to pHu- while their body weight was no different. At both ages, muscle glycogen content was lower in pHu+ than in pHu- muscles. The lower ability of pHu+ chicks to store carbohydrate in their muscle was associated with the increased expression of and genes coding glucose transporters 1 and 3, and of and coding key enzymes of oxidative and glycolytic pathways, respectively. Reduced muscle glycogen content at hatching of the pHu+ was concomitant with higher activation by phosphorylation of S6 kinase 1/ribosomal protein S6 pathway, known to activate protein synthesis in chicken muscle. In conclusion, differences observed in muscle at slaughter age in the pHu+ and pHu- lines are already present at hatching. They are associated with several changes related to both carbohydrate and protein metabolism, which are likely to affect their ability to use eggs or exogenous nutrients for muscle growth or energy storage.
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