Heightened health protocols will cause only minor hold-ups to Fonterra's milk operations through the four-week lockdown

Fonterra

But, CEO Miles Hurrell's promising milk supply won't be affected, and is assuring Kiwis there's no need to panic buy milk.

He says all Fonterra's office workers are now at home, which will slow down some long-term projects.

But, Hurrell says picking up, processing and tightening milk will remain as normal but the likes of temperature checks at factories will slow them down slightly.