Queensland Agriculture Minister John McVeigh says no criminal charges will be laid over the deaths of 46 cows near Townsville in the state's north earlier this year.

The cattle died earlier in May after being left without water at the Swans Lagoon research station near Ayr.

Concerns were raised about the management procedures and how long the cattle were left without water.

A police investigation was launched into the deaths.

Mr McVeigh says the investigation is being finalised but says he has interim advice that no criminal charges will be laid.

He has told a budget estimates hearing that disciplinary action has been taken for negligence and there has been changes made to management procedures.

He says the Government is still reviewing if further disciplinary action is required.