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Proteins related to hunter L^(＊) value and drip loss in pig m. longissimus dorsi during chiller ageing were identified. Two-dimension gel-based proteome anaylsis was conducted at 0, 1, 3, and 7 day postmortem for six male landraces with various meat quality traits. Results showed hunter L^(＊) value and drip loss were highly correlated (r＝0.8, P＜0.05), and high lightness and drip loss coincided with high proteolysis rate. Twelve proteins were related to hunter L^(＊) value, which in cluded contractile apparatus and related proteins such as alpha actin, myosin light chain 1, cofilin 2 and troponin T, and chaperone proteins of alpha-b crystalline. Four proteins (troponin T, adenylate kinase, ATP-dependent proteinase SP-22, and DJ-1 protein) were related to drip loss. Discriminant analysis for the classification of objective meat quality traits using these proteins excluded myosin light chain 1, substrate protein proteinase SP-22, adnylate kinase, and actin fragments from the final model. the model successfully classified all pale, soft, and exudative (PSE) meat, while four out of six dark, firm, and dry (DFD) samples were classified into PSE (two samples) and normal (tow samples). Current model study demonstrated proteomics are number of animals and identified proteins in this study.
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