>>532798372
There has been studies on whether or not he was actually juiced. Now during this time there were alot of horses on juice, that has mostly been stopped due to the fact all winning horses do have to piss clean before their owners can collect their winnings. The large heart was most likely a genetic defect that greatly enhanced his career. One such evidence to sorta go against the juicing alligations was he had such a high fertility rate, which if he was on roids would stop that.

>>532798578
Its hard to get a true one to one comparison of the sport because most of Japan's races are on turf while American racing is done on dirt. Also another thing about American racing that differs is the entry for big races are much more strict, for example most of the big G1 races in America are only for horses 3 and under. This is because they want to find prime sires and retire them before they get injured. In Japan horses can enter races multiple times. Horses are actually still growing and dont hit their prime till about 4 years old, so we actually didn't even see Secretariat at his peak.

>>532798602
Because there is alot of testing in the sport now. Every year the Japanese send like one horse in the Derby, but they have yet to win it.

>>532799008
Brother this was over 50 years ago. No horse has matched him in over 50 years. That is nearly 25 generations of breeding with modern record keeping.