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Rob Hewett and Fiona Hancox retire by rotation at the company's annual meeting in Dunedin on April 18 and both are standing for re-election.
Nominations have also been received for Mid Canterbury farmer Chris Allen, who is a Federated Farmers national board member, and former Federated Farmers chief executive Conor English.
Voting papers will be posted to eligible shareholders on April 4 and voting will close on April 16.
The result will be announced before the annual meeting.