Dairy product prices fell at the Global Dairy Trade auction, led by declines in rennet casein and whole milk powder.
The GDT price index slid 1.1 percent from the previous auction two weeks ago. The average price was US$3,465 a tonne. Some 19,508 tonnes of product was sold, up from 19,262 tonnes two weeks ago.
Whole milk powder fell 1.5 percent to US$3,231 a tonne.
The decline followed Fonterra's revision of its full season milk production forecast on Tuesday.
"An indication of a little more product than previously expected being available before the end of the season may have meant buyers were less willing to pay more to secure whole milk powder at this event," Amy Castleton, AgriHQ dairy analyst, said in a note.