Estimation of genetic correlations between racing times recorded at different racing distances by restricted maximum likelihood in Thoroughbred racehorses.
Abstract: Genetic correlations between racing times on track type (turf and dirt), and at racing distances on turf (1200 m, 1400 m, 1600 m, 1800 m, and/or 2000 m) and dirt (1000 m, 1200 m, 1400 m, 1600 m, 1700 m, and/or 1800 m) tracks, were estimated in Thoroughbred horses. (Co)variance components were estimated using multiple-trait derivative-free restricted maximum likelihood (MTDFREML). The data used were collected by the Japan Racing Association from 1992 to 1993. The generation 2 pedigree information was preferable for (co)variance estimates. The genetic correlations between racing times on turf and dirt tracks ranged from 0.69 to 0.31 (average 0.51). The genetic correlations between racing distances ranged from 0.68 to 1.00 (average 0.85) and from 0.53 to 1.00 (average 0.88) on turf and dirt tracks, respectively. These results suggest that the racing time per 100 m can be used for horse genetic evaluation within one track type. ZUSAMMENFASSUNG: Schätzung genetischer Korrelationen zwischen Rennzeiten von Vollblüternüber verschiednen Distanzen mittels restringierter Genetische Korrelationen zwischen Rennzeiten auf Rasen- und Erdbahnen, Renndistanzen auf Rasen- (1200, 1400, 1600, 1800 und 2000 m) und Erdbahnen (1000, 1200, 1400, 1600, 1700 und 2000 m) wurden für Vollblüter geschätzt. (Co)Varianzkomponenten wurden mittels Mehr-Merkmal Ableitungsfreier Restringierter Maximum Likelihood (MTDFREML) geschätzt. Die Unterlagen wurden von der Japanischen Renn Vereinigung 1992 und 1993 gesammelt. Generation 2 Abstammungsinformation war für die Co-Varianzschätzung günstig. Genetische Korrelationen zwischen Rennzeiten auf Rasen und auf Erdbahnen waren zwischen 0.69 und 0.31 (Durchschnitt 0.51), jene zwischen Distanzen zwischen 0.68 und 1.00 (Durchschnitt 0.85) und zwischen 0.53 und 1.00 (Durchschnitt 0.88) auf Rasen und Erdbahnen. Die Ergebnisse zeigen, daß Rennzeit per 100 m zur Bewertung der Pferde geeignet ist.
1997 Blackwell Verlag GmbH.
Publication Date: 1997-01-12 PubMed ID: 21395814DOI: 10.1111/j.1439-0388.1997.tb00504.xGoogle Scholar: Lookup
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Summary
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This study reveals the genetic correlations between racing times across different track types and lengths among Thoroughbred horses, suggesting that racing time per 100m can be utilized in evaluating horse genetics within one track kind.
Research Context and Methods
- The researchers worked on estimating the genetic correlations between different racing times given the varying track types (turf and dirt) and racing distances (from 1000m to 2000m).
- The study was conducted using data collected from Thoroughbred racehorses by the Japan Racing Association during 1992 and 1993.
- They employed (Co)variance components in tandem with a method called multiple-trait derivative-free restricted maximum likelihood (MTDFREML) to get these estimates.
- Also worth noting is that the researchers found that second-generation pedigree information was beneficial to their study in making these estimates.
Results of the Study
- The genetic correlations recorded between racing times on turf and dirt tracks ranged between 0.69 and 0.31, with an average of 0.51.
- For specific racing distances on turf and dirt tracks, the correlations ranged from 0.68 to 1.00 and 0.53 to 1.00, respectively. The average genetic correlation was 0.85 on turf and 0.88 on dirt tracks.
Significance of the Study
- The findings suggest that racing times per 100m can be an effective metric when evaluating horse genotypes within a specific track type.
- The discovery of genetic correlations between racing times at different distances and terrains provides valuable data that can potentially inform betting practices, horse selection for specific tracks, and further genetic research in racehorses.
- This study adds a new dimension to our understanding of the genetics that underpin performance in racehorses and sets the groundwork for future research in this area.
Cite This Article
APA
Oki H, Sasaki Y, Willham RL.
(1997).
Estimation of genetic correlations between racing times recorded at different racing distances by restricted maximum likelihood in Thoroughbred racehorses.
J Anim Breed Genet, 114(1-6), 185-189.
https://doi.org/10.1111/j.1439-0388.1997.tb00504.x Publication
Researcher Affiliations
- Equine Research Institute, Japan Racing Association, Utsunomiya, Tochigi, Japan Department of Animal Science, Kyoto University, Kyoto, Japan Department of Animal Science, Iowa State University, Ames, Iowa, USA.
Citations
This article has been cited 1 times.- Maeda Y, Hanada M, Oikawa MA. Epidemiology of racing injuries in Thoroughbred racehorses with special reference to bone fractures: Japanese experience from the 1980s to 2000s. J Equine Sci 2016;27(3):81-97.
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