Butter prices are spiking higher as a global shortage becomes acute and record highs are expected over the winter months.
In a note after this week's GlobalDairyTrade auction, ASB senior rural economist Nathan Penny said butter prices had spiked by about 30% so far this year and were only 4% below the record levels of September last year.
The final GDT event for the 2017-18 production season saw overall dairy prices lift 1.9%.
Anhydrous milk fat prices jumped 5.8% and butter prices rose 2.4%.
Rabobank dairy analyst Emma Higgins said Europe was short on fats with a delay in spring production so low volume was helpful for Oceania price support.