Prices of dairy products fell in the first sale on Fonterra Cooperative Group's GlobalDairyTrade platform for 2012, paced by whole and skim milk powder.
The GDT-TWI Price Index fell 0.7 per cent compared to the last sale two weeks ago.
The average winning price declined to US$3,654 a metric tonne from US$3,688 a tonne in the December 20 sale.
The price of whole milk powder declined 0.8 per cent to US$3,554.
Commodity prices fell through much of 2011 as investors fretted the impact of Europe's debt crisis could have in slowing global growth.