What’s the connection between ethanol, the biofuel produced from corn, and a cherry vanilla ice-cream?

Answer: the first is responsible for pushing up the price of the other.

This month, the price of milk in the United States surged to a near-record in part because of the increasing costs of feeding a dairy herd. The corn feed used to feed cattle has almost doubled in price in a year as demand has grown for the grain to produce ethanol.

The squeeze on ice-cream makers, chocolate manufacturers and pizza companies – all of whom use dairy produce as a raw material – is set to tighten as the price of a gallon of milk in the US – up 55 per cent in the past 12 months in some American states – is now the same as a gallon of petrol, with dairy prices accelerating faster than the cost of fuel.