Rice Growers Ltd, which trades as SunRice, says it's losing its managing director to another agri-business co-op. The departure of Gary Helou to run Murray Goulburn Co-operative from September follows Rice Growers shareholders' rejection of a takeover bid from Spanish group Ebro Foods.There is no indication that the two events are linked. SunRice chairman, Gerry Lawson, said the company would begin a search for a new chief executive officer.