The GDT recorded its fourth consecutive decline since the beginning of 2016 after the benchmark dairy index lost almost 3% at this week’s auction in New Zealand. The average price of product sold fell by 2.8% to $2,235/t, while volumes traded remain low.Whole milk powder (WMP) prices were back almost 4%, while skimmed milk powder (SMP) contracts were back more than 1%. Rennet casein prices were back the most after falling 12%, while there were also decreases in the average selling price for cheddar (-5.6%), butter (-2.3%) and butter milk powder (-1.2%).