ABSTRACT: This study examined the developmental and genotype dependent expression of key myogenic (MYOD1, MYOG, PAX7), growth related (IGF1, GHR, MSTN), mitochondrial (ANT, COXIII, UCP), and antioxidant (SOD1, CAT) genes in skeletal muscles of Japanese quail (Coturnix japonica). Muscle samples from pectoralis major (glycolytic) and biceps femoris (oxidative) were collected at post hatch days 3 and 42 from three genotypes (Japanese, Jumbo, and Texas). RT-qPCR data, normalized with ACTB, revealed distinct stage, muscle, and genotype dependent regulation across gene groups. Early post hatch stages showed elevated expression of MYOD1, MYOG, and IGF1, associated with active myoblast proliferation, while MSTN and UCP increased at day 42, reflecting developmental stage-related changes associated with muscl
