French genomic evaluation of show jumping in sport horses

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Govignon, Armelle | Danvy, Sophie | Moureaux, Sophie | Ricard, Anne

Edité par CCSD -

International audience. In France, estimated breeding values (EBV) of show jumping horses are based on performances in official competitions. Genomic data were first introduced in 2023. Performance data have been collected since 1985 and included 347,137 horses, Genotypes were obtained from 3 different beadchips from 54602 SNPs (Illumina Equine 50) to 670,806 SNPs (Affymetrix Axiom Equine) on 3,658 horses available from previous research including 2,241 males. After quality control, all genotypes were imputed to 375,687 SNPs. Two traits were considered: annual sum of points earned in each event according to rank and technical difficulty, and rankings considered as the result of the expression of an underlying unobservable performance. The model included fixed effects of a combination of age, year and sex, random effect of genetic additive value (relationship matrix included 617,903 horses) and permanent environment effects to consider the repeatability inside one year for ranking and between years for ranking and the annual points. A Single Step GBLUP model was applied using BLUPf90 software which combines all the information (genotypes, performance and pedigrees). Heritability was 0.31 for annual sum of points and 0.13 for ranking. For the population of 57,921 horses with performance in 2023, correlations between GEBV and EBV ranged from 0.934 for genotyped horses to 0.992 for non-genotyped horses. For sires, correlation was around 0.99. Currently, the equine industry is working on a project based on a 60,000 SNP array developed by the French research to be used routinely for parentage control and breeding evaluation.

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