Special problems in genetic evaluation of performance traits in horses.
Performance is separated in two ways : success and stayability which allows success. The first one is treated as an underlying performance responsible for the ranking observed in the race or competition. Heritability of such criteria on jumping is 0.16 and repeatability 0.29. The model is validate by calculation of a posteriori probability of event The second one is treated with survival analysis. Heritability of functional stayability in jumping is near 0.18. Particularity of horse's models is approached through examples on trainer effects and on the efficiency of animal model used since several years.