New Zealand's primary industries believe its unrealistic to replace all migrant workers with unemployed Kiwis.

With the borders still shut due to Covid-19 restrictions, the flow of overseas workers have come to a halt.

Fonterra CEO Miles Hurrell told Heather Du Plessis-Allan there are pockets of the industry hiring Kiwis but not enough.

"We're talking to the Government, we'd like to see a bit of relaxation to ensure we could get those workers through."

Listen to the full interview on Bosses Rebuilding above