Dairy farmers are being warned to keep their employment agreements and time records up to date.

The Labour Inspectorate has launched a nationwide probe into compliance of farmers in the industry.

Six farmers have already been left with infringement notices of $1000 to $2000 for breaching the basic requirements.

Labour Inspectorate regional manager Natalie Gardener says she was disappointed to find half of the farms she visited in the Waikato were in breach.

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She says keeping documentation up to date is the foundation of a good employment relationship.