Cheese prices decreased by 4 per cent and beef prices eased by 1 per cent.
But ANZ said it was not all one way traffic, with six commodities posting a lift in prices.
Aluminium prices recorded the largest increase, lifting 6 per cent, followed by sheepmeat prices which rose 3 per cent.
The prices of wood pulp, seafood, and wool all increased 1 per cent, and lumber prices nudged up a quarter of one per cent. The prices of logs, kiwifruit, apples and venison were unchanged in the month.
The New Zealand dollar strengthened across all our major trading partners, with the exception of the Australian dollar.
This exacerbated the fall in commodity prices when converted in the local currency, resulting in a 5 per cent fall in the ANZ NZD Commodity Price Index for April, which was at a 13-month low.
See more from the latest commodity index here: