VERSAILLES, Ky. - Dynaformer, the sire of Kentucky Derby winner Barbaro, died Sunday at Three Chimneys Farm two weeks after suffering a heart attack in his stall.

The 27-year-old stallion was one of the most successful sires in the thoroughbred industry with 21 crops that have earned more than $105 million, including 130 stakes winners and 18 millionaires.

Three Chimneys president Case Clay said in a news release Sunday that "Dynaformer impacted the industry in a way that few ever have or will" and called him an awe-inspiring horse to be around.

Dynaformer's death came on what would have been the ninth birthday of Barbaro, who won the Derby but broke down in the 2006 Preakness Stakes and later was euthanized at the New Bolton Center in Chester County.

Dynaformer ruptured an aortic valve April 14. An ultrasound the next day revealed several holes in his heart.