Proteomics and bioinformatics analyses based on two-dimensional electrophoresis and LC-MS/MS for the primary characterization of protein changes in chicken breast meat from divergent farming systems: Organic versus antibiotic-free

•Two-dimensional electrophoresis to characterize the organic and antibiotic-free chicken breast muscle proteome.•Discovery of protein biomarkers discriminating among chicken strains and farming systems.•Impact of organic farming on chicken meat proteome among two strains.•Bioinformatics to decipher the underlying biological mechanisms.