ArticleJournal of equine science2026
Genetic diversity and genomic inbreeding trends in the Japanese Thoroughbred population.
Article in Journal of equine science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Thoroughbreds are maintained under a closed studbook and have undergone intense selection for racing performance, potentially reducing genetic diversity and increasing inbreeding. As inbreeding can adversely affect fitness, monitoring inbreeding levels and conserving genetic diversity are essential. In this study, we assessed the temporal changes in genomic diversity and genomic inbreeding in Japanese Thoroughbreds using high-density single nucleotide polymorphism (SNP) genotyping. We genotyped 96 foals born in each of the years 2000, 2018, and 2022 using a 670 K Axiom Equine Genotyping Array, excluding two samples due to insufficient genotypic information. After quality control, we retained 363,301 autosomal SNPs for downstream analysis. Per-locus expected heterozygosity (mean ± standard deviation [SD]) revealed only a slight decline across the cohorts: 0.309 ± 0.156, 0.305 ± 0.158, and 0.304 ± 0.159 for 2000, 2018, and 2022, respectively, with a statistically significant but negligible effect size (η
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