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more likely, it's breeding for single traits (speed) and allowing weaknesses to develop (lighter bone, for example.) The ubiquitous use of lasix, bute, and other medications may also play a part, allowing weaker horses that might not have done well without to achieve and be added to the gene pool.
That, and the simple fact that it costs money to care for horses. In the case of the racing industry, time = money, and therefore horses are started years before they should be, and conditioned too quickly to develop bone strength; all a matter of $$$.
All horses, regardless of breed, mature skeletally at the same rate; they are fully mature, with all cartilage fused into bone, at about 6 years old. It's no wonder so many break down, raced as youngsters. The breed would be stronger, and sounder, and more able to go the distance, if the athletes were allowed to fully mature before racing. Spending a couple of years racing as a youngster, not fully developed, and being sent to the breeding barn does not result in the strongest and best being saved for breeding; just the most precocious or luckiest.
Speaking of lucky, Lookin' At Lucky isn't even three yet. He is technically 3, since all TBs age on January 1st. His real bday, though, isn't until May 27th. He's run all of his races as a 2yo.
There were 3 triple crown winners in the 70s, after a 3-decade drought. Then another long drought. It's probable that breeding for increased speed has added muscle mass and and speed that equine skeletons are simply not designed to handle. There may never be another triple crown winner; if there is, it will be because of the x-factor, an unusually sturdy horse, legal drugs, and a larger than fair share of luck.
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