The nation's major sports codes, including the AFL, NRL and Cricket Australia, have joined the fight to secure controversial exemptions to the Turnbull government's looming siren-to-siren ban on daytime gambling advertising.

In an effort to reduce children's exposure to betting ads, the government last year announced a prohibition on gambling promotions during "all live sports broadcasts" between 5am and 8.30pm, which would take effect from five minutes before the start of play to five minutes after the final siren. Horse, harness and dog racing would be exempt from the ban.

The Coalition for Major Professional and Participation Sports fears banning gambling ads will slash the value of media rights Credit:AP

But Australia's TV and radio broadcasters have been accused of trying to "water down" the ban by proposing a string of further exemptions that would exclude certain forms of betting advertising altogether and allow gambling ads to be aired every two hours during long, multi-match sports events such as the Olympics, the Rugby World Cup, golf and tennis.

Now, the industry group representing all of Australia's major sporting codes, the Coalition for Major Professional and Participation Sports, has also thrown its support behind some of the broadcasters' divisive proposals.