Dynaformer, one of the most prolific international sires in recent decades, was pensioned at Three Chimneys Farm after experiencing a significant cardiac event in his stall on Saturday.
The 27-year-old son of Roberto is resting comfortably at the farm, according to a release from the farm.
"Dynaformer's heart condition is not uncommon in older horses," said Three Chimneys resident veterinarian, Dr. Jim Morehead, said in a release. "Sometimes these conditions deteriorate and further breeding only increases the risk to the horse."
Best known for siring 2006 Kentucky Derby winner Barbaro and multi-millionaire Perfect Drift, Dynaformer's runners have proved versatile worldwide.
Never miss a local story.
Other notable runners by Dynaformer include Lucarno (English champion 3-year-old colt), Americain (Melbourne Cup winner), Rainbow View (European champion 2-year-old filly), as well as Grade I winners Riskaverse, Film Maker, Starrer, and Dynaforce. Dynaformer also sired champion steeplechase star McDynamo.
"Dynaformer's tough spirit will continue to influence our breed for many years to come," Robert Clay, owner of Three Chimneys Farm, said. "He reminds us that looks aren't everything, and that the will to win is that intangible ingredient we are all striving to find."
Bred and campaigned by Joseph Allen, Dynaformer was a multiple Grade II winner on the track, taking the 1988 Jersey Derby and Discovery Handicap. Upon retiring with seven wins from 30 starts and more than $671,000 in earnings, Dynaformer began his stud career at Nathan Fox's Wafare Farm for an advertised stud fee of just $5,000.
From his initial crop of 47 foals, 46 went on to race and five of those were stakes winners, including Blumin Affair, who was second in the 1993 Breeders' Cup Juvenile and third in the 1994 Kentucky Derby.
Dynaformer relocated to Three Chimneys for the 1995 breeding season and has been with the farm ever since.
Over the past 21 days, three of Dynaformer's progeny became U.S. graded stakes winners for the first time, including Karlovy Vary, winner of the Grade I Central Bank Ashland Stakes at Keeneland.
Daddy Nose Best works
Daddy Nose Best continued his preparation for the Kentucky Derby with a 5-furlong breeze at Churchill Downs on Monday morning in 1:00.20 for trainer Steve Asmussen.
Working on the outside of stablemate Hierro, Daddy Nose Best recorded fractions of :12.40, :24, :35.80 and :47.60 and galloped 6 furlongs in 1:13.80 and 7 furlongs in 1:29.20. It was the fastest work of 20 at the distance.
"I thought it was a great work," Asmussen said. "He went over the track really well and I'm glad we were able to get the work in before the rain hit."
Asmussen noted that "if the weather lets us," Daddy Nose Best will have two more workouts prior to the Derby on April 23 and April 30.
Prospective iffy for Derby
Prospective, winner of the Grade II Tampa Bay Derby on March 10, might not run in the Kentucky Derby after a sixth-place finish in the Grade I Blue Grass Stakes at Keeneland.
"He came out of the race in good order, but we are still discussing whether to run in the Derby," trainer Mark Casse said. "Right now I would say we are 50-50 on whether or not to run."
Casse is unsure when a final decision will be made for the son of Malibu Moon.
"The most important thing is how he trains," Casse said. "But even if he trains well, we won't definitely go (to the Derby)."