Rising feed prices are driving farm expense inflation, ASB's Commodities Weekly says.
In annual change terms, farm input prices rose 3% in June, and rising feed prices were driving much of the overall rise.
Over the same period, feed prices jumped 5.8%, which was a marked turnaround after feed prices were largely unchanged in the year to June 2017, senior rural economist Nathan Penny said.
Fuel prices had also climbed rapidly over the past year. Since June 2017, prices had lifted 20%, and that lift had coincided with rising global oil prices, the weaker New Zealand dollar and rising fuel taxes.
The bank was expecting input prices to continue rising at a similar pace over the year ahead, Mr Penny said.