Müller's decision to bid for UK milk supplier Robert Wiseman Dairies was the first major M&A move of 2012 and sparked plenty of debate, with industry watchers arguing the German yoghurt maker will face challenges in a fiercely competitive industry. Strikes at Unilever, job cuts at Kraft Foods and US dairy processor Dean Foods and continued gloom over the prospects of retail giant Carrefour also attracted headlines this week.