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Originally Posted by Balletto
I think there was a correlation being made on the "big heart" gene. Secretariat was known to have an enlarged heart and it appears to have been passed to his daughters. I think Princequillo is the biggest contributor of that and to the breed in the last 50 years.
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the enlarged heart passes thru the female line... that's why secretariats foals didn't get it, but the fillies pass it on when they breed, which explains his tremendous success as a broodmare sire. his daughters pass on that part of his greatness.