For the preservation of Misaki horses, changes in the population structure and genetic diversity of the horses for 5 years were analyzed using population and genotype data from 2015-2020. The microsatellite genotyping was performed, and the average number of alleles (Na), expected heterozygosity (He), and observed value (Ho) were calculated. Moreover, the average generation length (GL) was estimated from the population management record. Then, no significant differences in Na, He, and Ho were found between 2015 and 2020, suggesting their genetic diversity had been maintained for 5 years. Moreover, the average GL was estimated as 4.6 years. Compared to other native horses, a short average GL suggesting a rapid generation renewing is a characteristic of the Misaki population.
Keywords: Misaki horse; genetic diversity; population statistics.