Because the whole idea of eugenics is to get something better by breeding the best. When you breed one winner to another winner, you improve your chances of getting another winner (at least in...
Practicing eugenics is the best way to ensure higher quality foals and therefore better future breeding stock as well. This also translates into more wins and more money for the breeders, owners,...
I am sure any type COULD be a racehorse but not all horses are cut out to be one. Most racehorses are quarter horses or thoroughbreds. A quarter horse is the fastest horse but can only run a short...