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He found that Secretariat had a HUGE heart. An average horse heart weighs 7.9 pounds (3.6 kilograms). Secretariatâs heart was not weighed, but it was estimated to weigh 22 pounds (10 kilograms).
To address the original question, I believe the statement that Secretariat had a heart almost twice the normal size can be traced back to a posthumous article written in Sports Illustrated by William Nack. He was quoting the doctor who performed the necropsy. But Secretariat was a very big horse in general.