The National Farmers’ Union claimed the move ignored the rising cost of milk production.
Dairy board chairman Gwyn Jones said: “On-farm costs have increased by more than 1.5ppl over the past two years. In light of this, it is difficult to see how Arla can justify this decision, particularly as it appears to have increased the price it is charging customers.
“The antics of some segments of the industry are making it increasingly difficult for dairy producers to extract a fair price from the market.”
Arla said it was “continuing to assess developments in the marketplace”.