The Darley breeding entity that stands stallions raced by Sheikh Mohammed is joining forces with the Robert Sangster family for a stallion base in Australia. As part of the venture, Darley is sending four stallions to stand at the Sangsters' Collingrove Stud in New South Wales.According to the announcement from Darley, stallions that will stand at Collingrove effective with the 2001 breeding season are Two Thousand Guineas (Eng-I) winner King's Best, Dubai World Cup (UAE-I) Singspiel, Middle Park Stakes (Eng-I) winner Lujain, and European champion 2-year-old Xaar, who stood his first season at Australia's Arrowfield Stud. Fees for the Darley stallions at Collingrove will be announced later.Oliver Tait, Darley's Southern Hemisphere manager, said the entity had been successful with its experiences Down Under. In addition to Xaar, Darley's Cape Cross stands at New Zealand's Cambridge Stud. Under Darley's arrangement with the Australian breeding farm, the stallions and nominations will be managed by Tait while 1,500-acre Collingrove will continue under management of Alan Morton, Collingrove's ownership by the Sangster family is also unaffected by the deal, the Darley announcement said.