The forestry sector also made a strong contribution to export growth for the second consecutive year.
The latest Situation and Outlook for Primary Industries report is a "timely reminder" of the importance of the primary sector to the wider economy, Federated Farmers vice-president Andrew Hoggard says.
The report, prepared by the Ministry for Primary Industries, showed New Zealand primary industry exports reached $38.1billion in the year ended June 2017, an increase of 2.4per cent over the previous year.
Mr Hoggard encouraged the incoming government to initiate policies which reflected that "so that all New Zealanders will continue to benefit".
"When the new Government sits down and closely analyses the value of our primary sector to the wider economy, they will acknowledge that we are very lucky to have such a robust and profitable agriculture sector, responsible for 75per cent of the country's total goods exports."
Dairy prices began recovering in the past year, which boosted exports despite the weather reducing production.
The forestry sector also made a strong contribution to export growth for the second consecutive year, driven by record demand for log exports to China. That offset a decline in meat and wool exports.
MPI forecast primary industries exports to rise 9.3per cent in the year ending June 2018 to $41.6 billion. That anticipated rise was primarily based on dairy prices remaining strong this season, plus a return to normal productivity levels across most sectors following adverse weather last year.
Those trends were projected to continue into the following year, resulting in a forecast of $42.4 billion in the year ending June 2019, up 1.8 per cent.
Compared with the Situation and Outlook report published in June 2017, exports for the year ended June 2017 were $7 million higher than previously estimated.
Forecast export revenue for the year ending June 2018 had been revised up by $50m, reflecting a more positive outlook in meat and wool and seafood, which was offset by a softer outlook for forestry. That was despite a New Zealand dollar that had strengthened over the past quarter and was now forecast at higher levels over the outlook period.
After reaching $14.6 billion for the year ended June 2017, New Zealand's dairy export revenue was forecast to rise over 18 per cent to $17.3 billion for the year ending June 2018.
Butter prices had continued to rise over the past three months, while whole milk powder prices had stabilised.
Consumer preferences for natural fats, instead of processed vegetable oils, continued to support high butter prices.
Butter prices were expected to continue to rise over the rest of 2017, before falling slightly from January 2018 onwards.
Growing numbers of bakeries in major Chinese cities were also driving increased demand for butter, with New Zealand's butter exports to China increasing from $355m in 2016 to $443m in 2017.
Dairy export revenue was forecast to remain at $17.3 billion for the year ending June 2019 because a small production increase was expected to be offset by a slight fall in dairy prices as butter prices started to recede from current record levels.
Meat and wool export revenue was forecast to expand 1.7 per cent in 2018 after falling 9.2 per cent in the year ended June 2017.
Lower lamb production in New Zealand and Australia were supporting higher lamb export prices. New Zealand's average export prices of beef and veal were expected to be slightly lower in 2018 due to plentiful supply of global exportable supplies.
Lamb production and exports were forecast to lift slightly over the next few years, with exports rising from $2.4 billion in 2017 to $2.5 billion in 2019.
With high wool inventory levels both in New Zealand and China, and the 2017-18 season's peak production coming in early 2018, it would be difficult for crossbred wool prices to rally in the near term.
Venison exports reached $162m in the year ended June 2017. Export volumes nearly fell 15 per cent and that lack of supply available to the market helped keep average export prices rising. Strong prices for both venison and velvet, plus positive population indicators, showed the potential for rebuilding deer herds over the next two years.
Log exports reached $2.7 billion for the year ended June 2017 on the back of another record quarter for both prices and harvest volumes. Log prices remained at historically high levels, surpassing $155 per cubic metre in the June 2017 quarter, and strong global and domestic demand was expected to continue to support strong log prices.
Horticulture export revenue increased 3.2 per cent in the year ended June 2017 despite challenging weather and the November 2016 earthquake damaging wine infrastructure.