Racehorse owners in Australia will be required to report the retirement of racing Thoroughbreds within 30 days under a new rule adopted by the Australian Racing Board (ARB).

The ARB said July 1 the rule makes it "compulsory" for owners to report a Thoroughbred's retirement, with the managing owner responsible for "advising the reason for their horse's retirement and their plans for the horse beyond its racing career."

Owners must indicate why the horse was retired—illness, injury, or for breeding purposes—and whether it will have a new home as an equestrian or pleasure horse, enter an official retirement program, or be sent to a livestock sale.

The ARB also said it has strengthened a rule that requires trainers to report the death of a Thoroughbred. They now will be asked to report the cause of death