Improved dairy trade access to the United States is a key objective of farmers attending or observing the latest round of Trans Pacific Partnership talks in Auckland.
The 15th round of TPP negotiations started last week and is due to end this week.
Federated Farmers and the National Farmers Federation of Australia are both participating.
With 11 Pacific countries including the US and Canada involved, and the Doha world trade negotiations not going anywhere, Federated Farmers president Bruce Wills said the TPP is the best chance right now to make further progress in breaking down agricultural trade barriers.
New Zealand Dairy Companies Association chair Malcolm Bailey said breaking down tariff and quoata restrictions in the dairy trade to the US is still a key objective, even though China and Asian markets are seen as holding the greatest potential for growth.
Mr Bailey said there's also a prospect of Japan joining the TPP later on.