Comparison of Some Random Regression Models for Racing Performances of the British Racing Horses in Turkey

Authors : Samet Hasan ABACI, Ümit COŞKUN, Hasan ÖNDER

Pages : 6-9

View : 17 | Download : 6

Publication Date : 2019-01-01

Article Type : Research Paper

Abstract :This study was conducted to compare some random regression models applied to Legendre polynomials insert ignore into journalissuearticles values(L insert ignore into journalissuearticles values(2.2);, L insert ignore into journalissuearticles values(2.3);, L insert ignore into journalissuearticles values(3.2);, L insert ignore into journalissuearticles values(3.3);); for that run on racing performance in British horses in Turkey. For this purpose, a total of 146850 race time record up to 15 races at different distances of 13625 horse taken from the Jockey Club of Turkey between the years of 2005 and 2016 was used. In this study, the genetic correlations between covariance components, heritabilities and race days for race completion times were estimated by using the DXMRR option in the DFREML statistical package program. The track type, the year and the horse`s age, the fixed effect, the track distance were taken as covariates and the breeding value estimates were made. -2logL, Akaike information criterion insert ignore into journalissuearticles values(AIC);, Bayesian information criterion insert ignore into journalissuearticles values(BIC);, Error Variance insert ignore into journalissuearticles values(RV); and Log likelihood values were used to compare models. Heritabilities insert ignore into journalissuearticles values(0.24 to 0.28);, additive genetic correlations insert ignore into journalissuearticles values(0.87 to 0.99); and phenotypic correlations insert ignore into journalissuearticles values(0.22 to 0.55); were estimated by L insert ignore into journalissuearticles values(2.3); random regression model which had the lowest -2LogL and BIC values. As a result, the L insert ignore into journalissuearticles values(2.3); model can be used for genetic evaluation and breeding of British racing horses.
Keywords : British horse, Race, Heritabilities, Additive genetic correlations