Secretariat sired more than 660 registered foals during his lifetime, with the exact number often cited as 663 named foals

. These offspring included 341 winners and 54 stakes winners, making a significant impact on thoroughbred racing bloodlines

. Although Secretariat did not produce male offspring of his own extraordinary racing ability, his legacy continues strongly through his daughters, who produced many notable sires and champions

. In summary, Secretariat sired approximately 663 horses officially registered as his progeny.