Abstract: Objective To explore the genetic polymorphisms of 16 STR loci from 449 Tibetan Mastiffs in order to set up gene polymorphism database of Tibetan Mastiff. Methods The PCR amplification was performed using the 16 STR loci fluorescent multiple amplification kit for dog. The amplified products were detected and statistically analyzed. Results In the 16 STR loci from 449 Tibetan Mastiffs, CDP was 0.999 999 999 999 999 and CEP was 0.999 997 795. Except FH2010 （10 alleles）, PEZ21 （12 alleles）, and PEZ05 （13 alleles）, the other STR loci had more than 15 alleles. In the 16 STR loci, H was >0.5 and PIC was >0.7. Conclusion The 16 STR loci have high polymorphism to be suitable for individual identification and paternity testing of Tibetan Mastiff. The data obtained through this study can be used to establish DNA polymorphism database of Tibetan Mastiff.

Key words: forensic genetics, polymorphism, genetic, short random repeats, Tibetan Mastiff