Mahmood Al Zarooni was given an eight-year ban by the British Horseracing Authority on April 25 for administering anabolic steroids to 15 Godolphin horses in training in Britain.
In a statement read out by Simon Crisford, the Godolphin racing manager, at a press conference afterwards, Mahmood Al Zarooni said: "First and foremost, I would like to apologise to His Highness Sheikh Mohammed as well as to all those involved with Godolphin and the public who follow British racing.

"I accept that it was my responsibility to be aware of the rules regarding prohibited substances in Britain.
"I can only apologise and repeat what I said in my statement earlier in the week - I have made a catastrophic error." - Godolphin. 

The 15 Godolphin horses, trained by Mahmood Al Zarooni and known to have been administered prohibited substances, are suspended from racing until October 9, 2013.

The suspension has been imposed by the British Horseracing Authority and is separate from the current disciplinary process.
Jamie Stier, Director of Raceday Operations and Regulation at the BHA, said: "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 six-month suspension runs from April 9 when the BHA tested the horses who are:-

ARTIGIANO (USA)
BATHRAT AMAL (JPN)
CERTIFY (USA)
COMITAS (GB)
DESERT BLOSSOM (IRE)
FAIR HILL (GB)
GHOSTFLOWER (IRE)
OPINION POLL (IRE)
ORKNEY ISLAND (GB)
RESTRAINT OF TRADE (IRE)
SASHIKO (GB)
SWEET ROSE (GB)
TEARLESS (GB)
VACATIONER (GB)
VALLEY OF QUEENS (IRE)