A free-range egg farmer says consumers are continually being duped with egg labelling at the supermarket shelf.

The past 12 months have seen the country's major supermarkets increasingly stock free-range eggs, but Victorian farmer Phil Westwood says it's only led to a greater saturation of incorrectly labelled cartons.

"What the supermarkets are doing doesn't actually increase the amount of free-range eggs available," said Mr Westwood.

"Most of the eggs in the supermarkets that are labelled free-range are intensively produced and would at best be called barn-laid."

Mr Westwood, who runs 1,200 free-range hens over 70 hectares in Grantville near Phillip Island in the state's south-west, says some producers are taking advantage of a lack of defined industry standards.

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"What really annoys me is when they make claims that are completely dishonest and they're duping consumers," he said.

"The problem is there is no legal definition of the term free-range.

"At the moment it is totally open to each producer to define what they do and there is no one looking over their shoulder."

A review of free-range labelling is set for April 2015, where ministers from around the country will look to set a national, legally enforceable definition of what constitutes free-range eggs.