TECH Signal 251
Thoroughbred breeding for speed narrowed genetic diversity without breaking Secretariat's record
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An article argues that centuries of breeding horses for speed may have reduced genetic diversity, which explains why Secretariat's 1973 Belmont Stakes record remains unbroken despite billions spent on breeding and training.
The piece uses thoroughbred racing to illustrate a broader pattern: intense selection for specific traits can reduce the genetic variation necessary for further improvement or even basic robustness. This dynamic has analogues in engineered systems where optimization for narrow metrics can strip away redundancy and adaptability.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Secretariat's 1973 Belmont Stakes record stands unbroken after 50 years and billions in breeding investment.
Breeding for speed may have narrowed thoroughbred genetic diversity, limiting further improvement.
Horses evolved from a 14-inch multi-toed forest dweller over 55 million years, with the single-toed hoof being a key innovation for efficient running.
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