The racehorses involved up in the Newmarket doping scandal have been suspended from running for six months.
The British Horseracing Authority said the 15 horses in question have been suspended from racing from 9 April, the day they were tested until 9 October.
"The length of suspension reflects the period beyond which the BHA is confident that the horses in question can have derived no performance-related benefit from the administration of these prohibited substances."
The decision on the horses was made by the BHA itself, rather than the disciplinary panel hearing the inquiry into trainer Mahmood Al Zarooni.
Racehorse trainer Mahmood Al Zarooni has been disqualified for eight years after 11 of his horses tested positive for anabolic steroids.
The Newmarket Godolphin stables are at the centre of horse doping allegations involving 11 horses and the trainer Mahmood Al Zarooni.