Economists say there is clear upside to $6 milk price forecasts following another strong GlobalDairyTrade auction result.
Overall prices increased 3.5% in this week's auction, paced by a 4.9% lift in whole milk powder prices.
Prices have now risen 56% since July, led by a 74% surge in whole milk powder prices which now sit at $US3593 a tonne.
ASB senior rural economist Nathan Penny said the relative strength in the price of whole milk powder reflected the market's ongoing reaction to the rapid decline, from an already weak position, in New Zealand production.
Prices for whole milk powder, New Zealand's key product, had surged about a third over the last four auctions while skim milk powder prices had jumped 18%.