The performance of thoroughbred horses results from a long-term selection for maximum gallop speed which is tested in races. Their results enable to evaluate trends in speed development and to estimate the breeding value of thoroughbred sires. Due to a low heritability of recorded race times and their high dependence on climatic, pedological and other factors, the performance of thoroughbred sires is most frequently specified on the base of subsidies, prize money or on the base of results of general handicaps (time form). According to authors of selection models, these performance characteristics have a medium coefficient of heritability. In our model of estimation of breeding value we have used both of them and results of the estimation of breeding value according to the criterion general handicap (GH) with a index of performance (IDP).
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