A significant price gap could open up across milk buyers in NI for June supplies, with Dale Farm announcing earlier this week that it is adding 1p/l to its May price, taking its base to 28.5p/l, including the 0.3p/l loyalty payment.Over the last three months, Dale Farm has been out in front in our monthly milk league, and kept slightly ahead of its main rival in NI, Lakeland Dairies.