Analysis of factors influencing the performance of English Thoroughbred horses in the Czech Republic
2000
Sebelikova, J. | Jakubec, V. | Majzlik, I. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
Significance of important factors influencing general handicap (GH) in the English Thoroughbred was determined. GH data from fat races of Thoroughbred horses in the Czechoslovak Republic in 1968-1993 and in the Czech Republic in 1994-1996 were used for analyses. Two linear models with mixed effects were used. Model 1 comprised these factors: year of birth (racing season), sex, father, mother's GH and mother's age. All factors were fixed except the factor father, it was considered as random. The factor father was omitted from model 2, the other effects were the same as in model 1. It was confirmed by the highly significant factor mother's GH that this inforamtion should be taken into account to estimate breeding value. Mother's age was insignificant in all age categories in model 1 while in model 2 it was significant in two-year horses only. A conclusion can be drawn on the basis of model 1 with higher informative capacity that no adjustment to the factor mother's age is necessary, that means it need not be applied to estimate and/or predict breeding value.
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