Keywords: FOXO, forkhead box class O; IGF-1, insulin like growth factor-1; LC3, microtubule-associated protein 1 light chain 3; MuRF-1, muscle RING finger-1; PGC-1α, peroxisomal proliferator-activated receptor γ coactivator-1 αBroiler; Fasting; Layer; Proteolysis;