The devaluation of the pound has added up to £30/t on organic feed costs
The devaluation of sterling following the EU referendum has increased organic feed prices by about £15 per tonne for low protein feeds and £30/t for high protein diets.
For dairy cows, cost of production would increase by about 1ppl for organic milk.
Soya prices increased by about £30/t and imported wheat, maize and beans increased by £10-£15/t.
Pete Griffin, Hi Peak Organic Feeds raw material buyer, said: "The cost increases come at a time when many cows are struggling at grass due to the cold spring and variable weather in May and June.
"Farmers have generally not got as much milk and solids off grass as they do in a normal year."
Mr Griffin said farmers may have to put cows on winter rations as soon as August to get cows prepared for winter.
“The feeds which will do the best job of this are the higher protein ones, of course which cost the most. But I am also confident they will be the most cost-effective in the end.
“What matters is not the cost per tonne of feed, it is what it delivers in terms of benefits on cow output, health and fertility which matters.”