According to the cases of common meat adulteration seen in the market,four kinds of adulteration models were built:mixed beef-pork,mutton-pork,beef-duck,and mutton-duck by extracting genomic DNAs from fresh beef,mutton,pork,and duck and premixing them at certain ratios.Through polymerase chain reaction(PCR) and sequence comparison using the universal primers COI-1 and COI-2,a COI gene–based method was established to detect adulteration in foods of animal origin.According to the pure meat DNA extraction rate...