Kiwi farmers may be expected to do more than their fair share to meet methane reduction targets.

A new scientific report from the Universities of Oxford and Cranfield has raised questions about the ambition of New Zealand’s methane reduction targets- and the responsibility falling on farmers.

Federated Farmers president Wayne Langford says farmers have been told they're responsible for half of New Zealand's overall emissions, but the report says otherwise.

"The current targets that are in place- our farmers just aren't going to accept. We don't mind doing our part and playing our role in what we have to do, but we can't do it with unrealistic targets."

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