Champion racemare Atlantic Jewel has run her last race and will be retired to Coolmore Stud in Ireland where she will be served by Europe's most successful stallion, Galileo.

The announcement follows her shock scratching on Tuesday from Saturday's Cox Plate after she injured a tendon in training.

Coolmore Australia general manager Michael Kirwan confirmed the decision on Wednesday, saying the mare will serve the necessary quarantine period at Coolmore's Hunter Valley base in Australia and leave for the organisation's Irish headquarters in County Tipperary.

Atlantic Jewel will be one of the first mares to be served by Galileo in the coming northern hemisphere breeding season.

For competitive purposes, it is desirable for racehorses to be born as soon as possible after January 1 in the northern hemisphere and August 1 in the southern hemisphere so they can be at an advantage in size and maturity with others of the same age.

With a mare's pregnancy lasting approximately 340 days, or 11 months, it is planned for Atlantic Jewel to be served in February so her subsequent foal will arrive at the optimum time.

Kirwan said the decision to retire the mare hadn't been a difficult one.

"She had a very serious injury 18 months ago and this is serious again so we decided it was time to retire her," Kirwan said.

He told Sky Sports radio Atlantic Jewel would stay in trainer Mark Kavanagh's Melbourne stable to recover from the initial effects of the injury before going to Coolmore's Australian farm.

"She deserves to be covered by the best stallion in the world and he has proved himself to be that," Kirwan said.

Atlantic Jewel won 10 of her 11 starts, her most recent successes coming in the Memsie Stakes and the Caulfield Stakes, both at Group One level.