ANZ Bank rural economist Con Williams said the market was struggling to digest more product at the start of the 2015/6 season, which peaks around September/October.
"And it looks like it will continue to struggle over the shorter term."
The volume of product being offered on at GDT auction is expected to rise over the next two months.
"It could get quite nasty because the major buyers do not appear to be there," Williams said.
"There are reports that some of those secondary markets - which have bought quite strongly over recent months - are not there as well."
On the plus side, there were signs production was starting to tail off in response to lower world milk prices.
"I think the dynamics are in place for lower output in New Zealand for 2015/16 but that won't come through until early summer," he said.
Backing the case for lower production is higher cow cull. The cull so far this year is close to 1 million, up about 20 per cent since this time last year, Meat Board data shows.