Police have been contacting known 1080 opponents in a bid to find the person behind a threat to contaminate New Zealand's baby formula stocks.

The Warehouse and Foodstuffs are reassuring customers they are doing everything they can to boost security in their stores.

News of New Zealand's infant formula contamination threat has spread across the world. Here is a selection of what the foreign press is saying.

1080 opponents have condemned those behind the baby formula threat letters, branding them "irresponsible" and their actions "total stupidity".

Should New Zealanders have been kept in the dark about the 1080 threats for nearly four months? The answer, on balance, is yes, writes John Armstrong.

Threats to contaminate infant formula with 1080 pesticide have been described as despicable and sick - but have caused more outrage than fear.

Local infant formula producers are optimistic the 1080 threat is minimal but are fearful of the reputation damage it could cause.

Dairy product prices rose in the latest overnight GlobalDairyTrade auction.

Murray Goulburn, Australia's biggest dairy co-operative, has confirmed a full-year forecast farmgate price of A$6 per kg of milk solids.

New Zealand's export dollar does not stretch as far as it did, after the terms of trade fell 1.9 per cent in the last three months of 2014.

Fonterra chief financial officer Lukas Paravicini rejects the notion that the co-operative is playing safe in keeping this season's farm gate milk price forecast at $4.70 a kilogram of milksolids.

Fonterra's board will have reason for cautious optimism when it meets tomorrow to review its farmgate milk price forecast for 2014/15.

Dairy prices posted their fifth consecutive gain at this morning’s GlobalDairyTrade auction.

Fonterra Co-operative Group has commissioned a new dairy ingredients plant in Heerenveen, in the north of the Netherlands, its first wholly-owned and operated ingredients plant in Europe.

Economic reform in China, one of New Zealand's largest trading partners accounting for 22 per cent of exports, is a lower priority than trying to save the Communist Party, according to Wall Street....

Dairy prices spiked higher at this morning's GlobalDairyTrade (GDT) auction, the GDT price index gaining 9.4 per cent since the last sale on January 21.

Reduced dairy production is expected to translate into higher prices at Wednesday's GlobalDairyTrade auction.

Fonterra will be spared having its multimillion-dollar fight with French food giant Danone spilling back into the public arena this year.

Spark New Zealand director Maury Leyland will resign from the telecommunications company's board from the end of next month.