Genetic Evaluation of Sires and Environmental Factors Influencing Best Racing Times of Thoroughbred Horses in Japan.

Abstract

The sire effect and the fixed effects of sex , training center, type of course, specific racetrack, horse age and track condition were evaluated regarding best racing times of thoroughbred horses . The records of best racing times at the Japan Racing Association were collected from the electronic racing book. The data set was edited so that each sire was required to have at least twenty progeny in the racing distances of 1200m and 1800m. The total numbers o f sires and progeny were 34 and 1486 for 1200m and 34 and 1520 for 1800m . First, the least-squares analysis of variance was carried out by using the linear model which included the sire effect and the six fixed effects. Second, heritabilities for best racing times were calculated , and additionally sire evaluations were carried out by using the sire model of the BLUP method .