Almost 2000 people are being viewed as persons of interest in the investigation into the threat to contaminate infant formula with 1080 poison.

All of the samples of infant formula tested by police after being suspected of possible tampering have tested negative for 1080.

Authorities are no closer to saying if the threat to poison baby formula with 1080 was a hoax, or who wrote the blackmail threats - even with 30 staff on the case.

Police are testing infant formula after a number of tins were found with pin-pricks in packaging lids.

Questions remain about some $15m of NZ infant formula arriving in China next week without new import certification introduced following the 1080 poison threat, says the head of an industry group.

Dairy companies are confident security measures at their facilities are tight enough to prevent a 1080 contamination.

Two projects to develop premium markets for New Zealand venison and lamb have won $41 million in government and industry co-funding under the Primary Growth Partnership

A 4WD track featuring steep slopes, a waterfall, boulders and pools of water is one of the attractions at this year's National Fieldays in Hamilton.

The value of primary exports will fall from unusually high levels over the 2014/15 year before recovering steadily in the following three years.

Kiwi infant formula could end up stuck on Chinese wharves - like Kiwi meat exports last year, says the head of an industry group.

One Kiwi traveller's decision to store his blood-soaked clothes from an exotic overseas trip landed him in hot-water with airport officials.

No further Queensland fruit flies have been found since the potentially devastating pest was detected in Whangarei this week.

NZ's booming infant formula industry fears Chinese regulatory changes could block smaller operators from doing business in the world's most lucrative and fastest-growing baby milk market.

Two West Coast men have denied starving 150 cows and 30 calves to the point where they have to be euthanised.

Two dairy farmers, a stock agent and a trucking company have been prosecuted for putting 25 cows through a hellish trip to the slaughterhouse.

New Zealand has halted all apple exports to China for the rest of the season after rot was found in several batches at the Chinese border.

Ministry for Primary Industries officials have approved an incursion programme in mid-Canterbury following a spillage of one of Europe's most invasive arable weeds - black grass - found in a consignment of imported fescue seed.