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Is heterozygotie at the “Gait Keeper” Gene an Advantage for the Trotteur Français ?
The objective of this study was to determine the impact of DMRT3 genotype on Trotteur Français race performances. 630 genotyped horses by Illumina 50K were used. Qualification, earnings, starts, number of breaking stride races, and best records were studied. These performances were corrected by fixed environmental effects estimated on a complete data of French races including 173,176 horses. Multiple traits mixed model analysis was then used to estimate genotype effect. Selection plan was modeled to verify if selection itself may explain differences among genotypes and to understand why the TF is a rare race breed with DMRT3 polymorphism. Results show that the CC genotype is unfavorable for all race traits. But CA even if unfavorable for qualification and early earnings had an advantage for earning after 5 years (+0.41 SD), and this advantage cannot be explained only by selection (less than 19% overestimated).
Keywords:
horse
trot
DMRT3
