Former shuttle sire Animal Kingdom will be relocated from Darley's Kentucky base to join the stallion ranks in Japan.
The Japan Bloodhorse Breeders' Association has acquired the son of Leroidesanimaux, who won the 1 Kentucky Derby and G1 Dubai World Cup.
Animal Kingdom retired with a 5-5-0 record in 12 starts and earned $US8,381,577 prizemoney
He shuttled to Arrowfield Stud for four seasons after John Messara acquired a majority interest in the stallion with his local progeny led by G1 Australian Derby winner Angel of Truth.
Now an 11-year-old, he has remained in the US for the past two breeding seasons and has sired 12 black type winners worldwide.
Japanese breeders will be interested in Animal Kingdom as Shadai Farm acquired his dam Dalicia (Acetenangho) in 2010.
She has produced four winners including the Deep Impact 3YO filly Satono Damsel, who suffered her first loss in four starts in last Sunday's G1 Shuka Sho.
Kentucky's Hill 'n/ Dale Farms has announced that Curlin, the world's top rating dirt sire, will be restricted to a book of 140 mares in 2020 on a fee $175,000.
Hill 'n' Dale president John Sikura stressed that Curlin's fee had remained unchanged.
"Allowing breeders to be profitable is essential and engenders loyalty to the Hill 'n' Dale stallions. I have always tried to provide fellow breeders with the best value possible," SIkura said.
Kitten's Joy - overall leading sire and leading turf sire of 2018 - will also have his stud fee remain at $75,000.
New on the Hill 'n' Dale roster is multiple G1 winner World Of Trouble, by Hill 'n' Dale stallion Kantharos.
Deep Impact's French classic winner Study Of Man has been retired and will stand his first season at Lanwades Stud in the UK in 2020.
A Flaxman Stables homebred for the Niarchos Family, the Pascal Bary trained Study Of Man won the 2018 Prix du Jockey Club.
Study Of Man join will join fellow Derby winners Sir Percy and Sea The Moon and Breeders' Cup Turf Sprint winner Bobby's Kitten at Lanwades.
The 2018 Epsom Derby winner Masar and last year's champion 2YO colt Too Darn Hot will stand their first seasons in 2020 at Dalham Hall Stud in Newmarket.
They will be joining their sires Dubawi and New Approach.
Bred by Godolphin and trained by Charlie Appleby, Masar won four of his 11 starts before injury cut short his career after two starts as a 4YO.
Too Darn Hot, a Watership Down Stud homebred for Lord Lloyd-Webber, won the G3 Solario Stakes, G2 Champagne Stakes and G1 Dewhurst Stakes in succession as a 2YO and at three won the G1 Prix Jean Prat and G1 Sussex Stakes for trainer John Gosden in a nine-start career before he sustained a career-ending injury in August.