At the latest GDT auction, rennet casein slumped 10.5 percent to US$5,177 a tonne, while anhydrous milk fat retreated 1.9 percent to US$6,032 a tonne.
Butter was steady at US$5,647 a tonne.
Meanwhile, skim milk powder gained 3.6 percent to US$1,999 a tonne, while cheddar rose 3.1 percent to US$4,024 a tonne.
"Fresh skim milk powder has been difficult to get hold of globally so buyers seem to be willing to pay for it right now," according to Castleton.
Lactose added 0.6 percent to US$616 a tonne, while buttermilk powder advanced 0.5 percent to US$1,990 a tonne.
The New Zealand dollar last traded at 70.07 US cents as of 1.25pm in New York, compared with 70.35 US cents at the previous close in Wellington.
There were 97 winning bidders out of 150 participating at the 14-round auction. The number of registered bidders rose to 519, up from 518 at the previous auction.
- BusinessDesk