Unbeaten racehorse Black Caviar, who is widely regarded as one of the best sprinters in racing, is due to be retired.

The Australian mare's trainer Peter Moody has claimed that it is the "right time" to end the six-year-old's career, which has recently been marred by injury woes.

Torn quadriceps resulted in an eight-month layoff for Black Caviar, who returned in February to win three more races, as well as the TJ Smith Stakes at Royal Randwick last week.

"She has done everything we have asked her to do," said Moody. "We thought long and hard about racing on but believe she has done everything we asked of her and felt it was the right time to call time on her wonderful career.

"She's in great shape and that's the way we wanted her to bow out. We just thought the time was right, it was a hard decision. She brought interest to our sport that hasn't been there for decades. Black Caviars don't come along every day."

The 2012 Diamond Jubilee Stakes winner will bow out with 25 consecutive wins.