Dairy prices have fallen in the latest global auction to a seven-month low.
After two small price drops in October, the average price fell 3.5 percent overnight to $US3105 a tonne.
The whole-milk powder price is down by 5.5-percent to $US2852 dollars a tonne.
That is the lowest it has been since the beginning of March and the first time it has dipped below $US3000 since April.
Farmers need on average $US3000 a tonne of milk solids to cover on-farm costs.