A Queensland government minister has admitted to using "colourful" language but says he doesn't remember using the word "f---tard' in an angry outburst over the premier's department.

Agriculture Minister Bill Byrne's chief of staff Tim Grau quit the office after the July 12 incident, reportedly sparked by a request to travel from Mareeba, on the Atherton Tableland, to Cairns, for a photo opportunity with Premier Annastacia Palaszczuk.

Bill Byrne has denied ever meaning to insult or denigrated disabled people. Credit:Chris Hyde

The Premier had reprimanded Mr Byrne over the incident, according to a spokesman.

"While these roles can certainly be challenging at times, the Premier has spoken to Minister Byrne and reminded him of the high standard of behaviour she expects of all ministers and ministerial staff," the spokesman said, in a statement.



"Minister Byrne is committed to his portfolio and is today travelling to a meeting of state and federal agriculture ministers in Melbourne, to keep fighting for Queensland farmers."