Investigation of the coefficient of inbreeding degree of TB stallions in Western Australia

The inbreeding may lead to an increase in the inbreeding level and the homozygosity rate of the genomesof thoroughbred horses. In order to provide a reference for introduction, use and breeding of thoroughbred horses,the pedigree data of 23 stallions of thoroughbred horses in Western Australian were collected and investigated forhaving a better understanding of inbreeding situation in stallions of thoroughbred breeds. The results showed that 16 stallions were inbred stallions, and the highest coefficient of inbreeding was 0.021 5, the average of the coefficient ofinbreeding of herd was 0.007 1,and no influence of inbreeding on performance of stallions was found while stallionsin this survey achieved most of wins prior to 5 years old.