Robert A. Alexander was the first to establish a systematic design method for horse breeding. Woodburn Stud was home to the stallion Lexington, America's leading sire for sixteen years. Lexington sired numerous champions and winners of major races including, Duke of Magenta, Kentucky and Preakness, for whom the Preakness Stakes is named. Woodburn breeding yielded 18 winners of U.S. Triple Crown race winners and other major winners including Lexington's grandson Foxhall. Some of the notable Thoroughbreds buried at Woodburn farm include Asteroid, Planet, and Australian, a son of the English Triple Crown winner, West Australian Although Lexington's success as a sire made Woodburn Stud near synonymous with flat racing Thoroughbreds, in fact during the mid to late 19th century, Woodburn was where the Standardbred horse originated and the farm was best known for these trotting horses for harness racing. After the death of Robert A. Alexander in December 1867, the operation prospered under his brother A. J. Alexander. But after A.J.'s death 1902, it went into decline. By the beginning of the 20th century, the farm was no longer in the horse business and had been converted to cattle land. In 1867, A. J. Alexander bred Preakness who would be purchased by Milton H. Sanford and for whom the Preakness Stakes is named. The American Classic Race winners bred by the Alexanders' Woodburn Stud are:
Today the Woodburn name is long gone but the horse breeding business was revived in 1972 as Airdrie Stud Inc. which now operates on, much of which is part of the original Woodburn Stud lands. Airdrie Stud, Inc. is owned by former Kentucky GovernorBrereton Jones and his wife Libby. Mrs. Jones is a descendant of the Alexander family. In 2000, the Airdrie-bred fillyCaressing won the Breeders' Cup Juvenile Fillies.
Stallions at Airdrie Stud
As of 2017, Airdrie currently stands eight stallions, including-
Include: A Gr.I winning son of Broad Brush and sire of multiple graded stakes winners, he commands a stud fee of $10,000.
Istan: A globetrotting son of Gone West, Istan won two graded stakes races and several ungraded. He commands a stud fee of $5,000.
Majesticperfection: A Gr.I winning son of Harlan's Holiday, he commands a stud fee of $15,000.
Mark Valeski: A multiple graded stakes winner of Proud Citizen, his stud fee is private.
Summer Front: A son of top sire War Front, he was an undefeated stakes winner as a juvenile and commands a stud fee of $10,000.
Upstart: His sire Flatter's best juvenile son, he won the Funny Cide Stakes, Gr.II Holy Bull Stakes and Gr.III Razorback Handicap throughout his career. A millionaire, he commands a stud fee of $10,000.