Analysis of nutritive value of biogas residues and heavy metal content in feedstuff with biogas residues and the pork fed on it Detection of the RYR1 Gene in Guizhou Indigenous Pigs and Three-crossbred Pigs CONTROLLING TECHNOLOGY OF OFF-ODOR AND LIPID OXIDATION OF IRRADIATED PORK EFFECT OF DIFFERENT ANTIOXIDANTS ON LIPID OXIDATION OF IRRADIATED COOKED STREAKY PORK Fast Detection of Freshness of Chilled Pork by Real-time Quantitative PCR INHIBITION EFFECT ON LIPID OXIDATION OF IRRADIATED PORK BY ADDING HAWTHORN FLAVONOID EXTRACT