Quote:
Originally Posted by Kasept
Stayers in a comfortable rythym that aren't draining the red blood cell/oxygen reserves stored in the liver because they haven't been stressed, can keep going a long time... longer than their pedigrees 'say' they can.
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It's actually the spleen that stores red blood cells in the horse. As for the stress component, remember that Shackleford was a handful going to the gate at Pimlico and from what I've read is typically a "hot-blooded" horse.