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Quantitative study for race times in thoroughbreds on dirt and turf tracks in Brazil
Titel:
Quantitative study for race times in thoroughbreds on dirt and turf tracks in Brazil
Auteur:
Marcilio Dias Silveira Da MOTA Daniel Madureira GOUVEIA FERREIRA
Verschenen in:
Revista científica UDO agrícola
Paginering:
Jaargang 8 (2008) nr. 1 pagina's 127-131
Jaar:
2008
Inhoud:
This study was conducted to estimate the genetic parameters for race times on turf and dirt tracks of Thoroughbred race horses. Data used were recorded by the Turftotal Ltd. for 343,419 racing performance of 26,713 animals, from January 1992 to January 2003. The model used in analysis included random animal and permanent environmental effects, and age, post position at start, sex and race as fixed effects. The variance and covariance components and the breeding value were estimated using the MTGSAM software. Heritability estimates were 0.29 for time on dirt track and 0.25 for time on turf track, indicating a moderate association between the animals’ breeding values and their phenotypic values. Although genetic and environmental variances were smaller in turf tracks, their repeatability was equal to that of dirt (0.56), in terms of the highest estimated phenotypic variance for the latter type of track. The genetic correlation between times on different tracks was high (0.70). Considering the mean breeding value of the progeny of 465 stallions with 10 or more offspring, Spearman’s correlation was 0.80, indicating that most Thoroughbred stallions produce offspring suited to both dirt and turf racing tracks.
Uitgever:
Universidad de Oriente Press (provided by DOAJ)
Bronbestand:
Elektronische Wetenschappelijke Tijdschriften
Details van artikel 156 van 185 gevonden artikelen
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