Butter slid 1 percent to US$5,280 a tonne.
Meanwhile, cheddar rose 1.7 percent to US$3,759 a tonne, while rennet casein gained 2.2 percent to US$5,128 a tonne.
Skim milk powder rallied 5.5 percent to US$2,051 a tonne.
"This strength was driven by higher prices for UHT grade product," Castleton noted. "Skim milk powder is running a bit short in New Zealand, but there is plenty of stock elsewhere in the world."
No prices were available for lactose.
The New Zealand dollar last traded at 72.94 US cents as of 12.26pm in New York, compared with 72.26 US cents at the previous close in Wellington.
There were 130 winning bidders out of 174 participating at the 22-round auction. The number of registered bidders rose to 529, up from 527 at the previous auction.