Bold Reasoning was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 racehorse foaled in Florida

Florida

Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

. He was out of the Hail To Reason

Hail To Reason

Hail To Reason was an American thoroughbred racehorse and an influential sire. He was bred in Kentucky by the Bieber-Jacobs Stable, a partnership of prominent horsemen, Isadore Bieber and Hirsch Jacobs. He was sired by the English stakes winner Turn-To, a grandson of the very influential sire Nearco...

 mare Reason To Earn, by the Santa Anita Derby

Santa Anita Derby

The Santa Anita Derby is an American Grade 1 thoroughbred horse race for three-year-olds run each April at Santa Anita Park in Arcadia, California and carries a purse of $1 million. Inaugurated in 1935, it is considered the most important West Coast stepping-stone to the Kentucky Derby...

 winner Boldnesian

Boldnesian

Boldnesian was an American Thoroughbred racehorse best known in racing for winning the 1966 Santa Anita Derby and as a sire. Scheduled to run in the Kentucky Derby, Boldnesian's racing career was cut short by an operation after bone chips were discovered following his win in the Santa Anita Derby...

, a son of Bold Ruler

Bold Ruler

Bold Ruler was an American Thoroughbred Hall of Fame racehorse.Bred by the Wheatley Stable of Gladys Mills Phipps, Bold Ruler was foaled on April 6, 1954 at Claiborne Farm in Paris, Kentucky to Nasrullah and Miss Disco by Discovery...

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Raced lightly, Bold Reasoning set a new track record at Belmont Park

Belmont Park

Belmont Park is a major thoroughbred horse-racing facility located in Elmont in the Town of Hempstead in Nassau County, New York, on Long Island adjoining New York City. It first opened on May 4, 1905...

 for 6 furlongs at 4. He is best known as being the sire of the 1977 Triple Crown

United States Triple Crown of Thoroughbred Racing

In the United States, the "Triple Crown" is usually the Triple Crown of Thoroughbred Racing, a series of three Thoroughbred horse races for three-year-old horses run in May and early June of each year consisting of the Kentucky Derby, Preakness Stakes, and Belmont Stakes.While Daily Racing Form...

 winner, Seattle Slew

Seattle Slew

Seattle Slew was an American Thoroughbred race horse who won the United States Triple Crown of Thoroughbred Racing in 1977, the tenth of eleven horses to accomplish the feat. He remains the only horse to win the Triple Crown while undefeated. In the Blood-Horse magazine List of the Top 100 U.S...

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Upon retirement, Bold Reasoning only produced three crops of foals at Claiborne Farm

Claiborne Farm

Claiborne Farm is a thoroughbred Horse breeding operation in near Paris, Kentucky. It was established in 1910, by Arthur B. Hancock, owner of Ellerslie Farm in Albemarle County, Virginia, and has been operated by members of his family ever since.-Owners:...

 before his death on April 24, 1975, due to a breeding shed accident in which he cracked his pelvis. He had to be euthanized

Animal euthanasia

Animal euthanasia is the act of putting to death painlessly or allowing to die, as by withholding extreme medical measures, an animal suffering from an incurable, especially a painful, disease or condition. Euthanasia methods are designed to cause minimal pain and distress...

after the injury caused severe colic.