Dairy farmers have seen their margin over costs completely eroded over the last 16 months. Describing Tuesday’s GDT auction price rise as “a line in the sand”, indicating a bottoming out of global dairy markets, IFA dairy chair Sean O’Leary said that processors must focus on immediately ending “16 months of continuous cuts in milk price”.While prices have fallen by 33% since May 2014, O’Leary says that margin has fallen by 92%.