Salisbury said the 1992 Melbourne Cup winner, a rising 20-year-old, worked his last race meeting at Moonee Valley earlier this month.
"They don't go forever. He's been doing this for 15 years and a hell of a lot of horses don't even live that long," Salisbury said.
"He's taught a lot of babies (two-year-olds) to be racehorses and helped a lot of horses to the barrier over the years."
Salisbury said Subzero also played a part in Choisir's win in the 2003 Group One Lightning Stakes at Flemington.
"Choisir got his head underneath the gates and busted out, but Subbie had the pace to pick him up," he said.
Trained by Lee Freedman and ridden by Greg Hall to win the 1992 Cup, Subzero appealed to Salisbury as a potential clerk of the course's horse right from his days as a yearling.
He was bred and bought to win a Golden Slipper but ended up as a gun stayer winning three Group One races including the 1992 South Australian Derby and Adelaide Cup as a three-year-old.
"Lee used to have him at my (former stables) place at Flemington," Salisbury said.
"When Lee retired him he was right up in the weights and was getting down on his bumpers and he asked me if I was still interested in taking him.
"He's been to Hong Kong, Singapore and spent five weeks in Dubai.
"He's still doing charity work and is RVL's ambassador.
"He visits about 30 schools a year and he's very good at it. He loves the kids and the kids love him."
Australian actor Hugh Jackman has even been aboard the grey.
Salisbury said Jackman rode him at the Palladium at Crown Casino for a charity function which raised $600,000.
Recently-retired flat performer and jumper Classic Karla is currently being trained by Salisbury to take over as his clerk of the course's horse.
By AAP
Photo: wikipedia.org