The GDT index got off to a negative start in 2017 after the benchmark dairy index recorded a 3.9% decline at this week’s auction in New Zealand. The slump in the price of whole milk powder (WMP) almost single-handedly dragged the index lower.Prices for WMP retreated almost 8% to an average of just under $3,300/t. However, while this may seem like a poor start to the year for milk powders, prices are almost 50% ahead of this time last year.