it\'s not fair to compare horses racing on steroids to horses not racing on steroids--even if they are racing on EPO and lasix, etc. the greatest value of steroids is that they aid and speed recovery times.
every time you exert yourself, you actually tear your muscles. if they can heal before your next exertion, you become stronger; if they can\'t, you become weaker--the body protects itself by slowing you down by causing more and more physical distress as muscle strain increases, so that you will stop doing whatever you are doing and rest...
successful doping is a synergistic cocktail of substances that have different but complimentary effects: increase aerobic capacity, buffer lactic acid, speed recovery time, burn glycogen instead of glucose.... each alone can help, esp. against clean competitors, but it is the combination that really puts you over the top.
pretty much every horse from the 1980s to the early to mid-2000\'s was running on steroids, and probably many of the 1970s horses too--that\'s when those big-muscled bulky horses really started to replace the true thoroughbred form. of this year\'s crop--oxbow\'s build looks the most like a horse on steroids. before the steroid age, the thoroughbred was a much slighter-framed horse...lithe, not robust (which makes since when you consider that the beyerly turk was probably very closely related to modern akhal-tekes).
you can\'t really blame 2:30 on the breeding out of stamina: assault finished in 2:30 4/5, whirlaway in 2:32, omaha in 2:30 3/5,gallant fox 2:31...no one would suggest these horses had distance limitations.
it wasn\'t really until about 1983 that sub-2:28 became common. the belmont was very rarely run under 2:29 from 1926-1979 (before 1926 it was a shorter race).
maybe what we are seeing are a more natural times, not weak crops (genetically speaking).
personally, i would try never to breed to any horse with raise a native within five generations, or at all if i could help it...raise a native was the horse that introduced the glass legs into the modern breed...but that being said, my dream is to acquire sea poppy and breed her to mizen mast--she has raise a native once within 4 generations, but it is worth it, because she has dr. fager top and bottom, as well as his sister ta wee.
i personally feel that dr. fager was the fastest dirt horse to ever live, and i believe that his speed was likely the result of a very high natural tolerance to lactic acid--which seems to be passed down through the forestry and fappiano lines. mizen mast has no inbreeding for a least four generations (and sea poppy\'s inbreeding is restricted to dr. fager). but it will never happen...alas...
fwiw, i believe that the big heart gene, and secretariat\'s large heart are a red herrings. tht larg heart gene is carried by lots of horses on the tracks these days, but there aren\'t any new secretariats...