AgriHQ analyst Susan Kilsby said the revised forecast sent the market a clear message.
"That is there isn't going to be heaps of product available, particularly whole milk powder which the world's so reliant on for supply from New Zealand," she said.
"We are working across a background of a lot of milk being produced in other parts of the world but they don't produce so much whole milk powder; they're producing more butter, cheese or skim milk powder so there isn't the potential for the price of those commodities to lift as much.
"But for whole milk powder, because New Zealand supplies more than half what's traded around the world, it has a big impact what's happening here in New Zealand."
At the latest Global Dairy Trade auction, some 25,400 tonnes of whole milk powder was sold, down from 29,592 tonnes two weeks ago. The product rallied 4.2 per cent to US$2886 (NZD$2045) a tonne.
Despite the fall in supply, Kilsby said it had not been the worst of seasons, with "a little bit of upside" present in the higher price for whole milk powder.
"The challenge for the farmers at the moment is a lot of them are carrying a lot of debt from the couple of seasons they had where they were making losses so while dairy should turn a profit this year anything is just going to go into servicing that debt. So you're not going to see a whole lot of additional flow-on into the rural economy."
- With BusinessDesk