Why does a horse breeder practices eugenics with two winning horses?

A horse breeder practices eugenics with two winning horses to enhance desirable traits in their offspring, such as speed, stamina, and temperament. By selecting proven champions with a strong genetic background, the breeder aims to produce a new generation of horses that exhibit superior performance and traits. This selective breeding strategy can lead to a more successful lineage, potentially increasing the value and success of future racehorses. Ultimately, the goal is to improve the overall quality and competitiveness of the breed.