The British Horseracing Authority has banned 15 Godolphin-trained horses involved in the doping scandal from competing for six months.

Godolphin trainer Mahmood Al Zarooni has been at the centre of what some are calling the biggest doping scandal in racing history after admitting that 15 of his horses were given anabolic steroids.

The trainer stood before a three-man disciplinary panel today after the governing body discovered that 11 of his 45 horses tested positive for banned substances in their own investigation.

A statement from the BHA said: "The BHA has today informed Godolphin, the owners of the horses in question, that the 15 horses known to have been administered with either Ethylestranol or Stanozolol have been suspended from running in races for a period of six months, with effect from Tuesday, April 9, 2013.

"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."

It is expected that Al Zarooni's licence will be revoked.