He has gone on to sire a number of other top racehorses, including Society Rock, Eagle Mountain, Varenar (Prix de la Forêt) and Samitar (Irish 1000 Guineas).
On 5 October he was bought for 330,000 guineas by the bloodstock agent Dermot "Demi" O'Byrne, acting on behalf of John Magnier's Coolmore organisation.
On 6 October he started at odds of 5/2 in a seven furlong maiden race at Gowran Park, County Kilkenny and finished second of the fourteen runners behind the Dermot Weld-trained Treasure Map.
Ridden by Seamie Heffernan, Mount Nelson established a clear lead approaching the final quarter mile and drew away from the field in the closing stages to win impressively by six lengths.
[7] Eight days after his win in the Curragh maiden race, the colt was moved up abruptly in class when he was sent to France to contest the Group One Critérium International over 1600 metres at Saint-Cloud Racecourse.
"[9] The trainer went on to mention the 2000 Guineas and the Poule d'Essai des Poulains as future targets, whilst bookmakers introduced him into the betting for the 2007 Epsom Derby at odds of 20/1.
On his return to racing as a four-year-old, Mount Nelson started odd-on favourite for the Mooresbridge Stakes at the Curragh in May, but was never in contention and finished sixth of the eight runners.
Racing against leading milers he started at odds of 33/1 and finished fifth of the ten runners behind Haradasun, Darjina, Finsceal Beo and Cesare, beaten just over a length by the winner.
[16] Mount Nelson was retired from racing to become a breeding stallion at Newsells Park Stud in Hertfordshire, where he stood at a fee of £6,000 along with Nathaniel and the leading sprinter Equiano.
At Royal Ascot in June 2013, Berkshire, a colt from Mount Nelson's second crop won the Listed Chesham Stakes by two and a half lengths.
He later moved to the Boardsmill Stud in County Meath where he stood as a National Hunt stallion, siring the Stayers' Hurdle winner Penhill.