Genetic Parameters of Performance and Conformation Traits of 3-Year-Old Warmblood Sport Horses in the Czech Republic.
Authors: Novotna Alexandra, Birovas Alena, Vostra-Vydrova Hana, Vesela Zdenka, Vostry Lubos
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Researchers analysed genetic data from 5,958 Czech Warmblood horses tested between 1998 and 2021 to establish heritability estimates for young horse performance and conformation traits, employing single- and two-trait animal models to assess 26 different measures including linear type assessments, quantitative measurements, and overall performance scores. The performance test overall score showed moderate heritability of 0.25, whilst quantitatively measured traits (such as jumping ability and rideability indices) demonstrated substantially higher heritability ranging from 0.46–0.57, suggesting these traits are more reliably passed on genetically; conversely, linear type traits varied considerably (0.04–0.33 heritability), with some conformational features being far less heritable than others. Genetic correlations between traits ranged from −0.47 to 0.92, indicating that whilst some characteristics are genetically linked in beneficial ways, others show trade-offs that breeders must consider. For breeding programmes and stud selection, these findings validate incorporating objective performance test results into genetic evaluation systems, particularly where quantitative jumping and rideability measures show strong inheritability; however, breeders should recognise that linear conformation traits alone are poor predictors of genetic potential and must be weighted alongside actual performance data to make informed selection decisions.
Read the full abstract on PubMed
Practical Takeaways
- •Performance test scores can be reliably used in breeding decisions for warmblood horses, though they explain only about 25% of variation—other factors remain important
- •Measurable traits (like stride length) are more genetically determined than visual assessments of type, making objective measurements more predictive for selective breeding
- •Breeders should recognize that some conformation and performance traits have weak or negative genetic correlations, requiring careful consideration of multiple traits when making breeding selections
Key Findings
- •Heritability of overall performance test score was 0.25, indicating moderate genetic influence on 3-year-old warmblood performance
- •Quantitatively measured traits showed higher heritability (0.46-0.57) compared to linear type traits (0.04-0.33)
- •Genetic correlations between traits ranged from -0.47 to 0.92, suggesting variable genetic relationships among performance and conformation characteristics
- •Performance test results are sufficiently heritable to support incorporation into genetic evaluation programs for Czech warmblood horses