Louisiana State University's main campus in Baton Rouge has identified $46 million in possible budget cuts for next year -- affecting everything from janitorial services to advanced technology research -- as the state's public colleges brace for steep reductions in state support when federal economic stimulus dollars expire in 2011-12. The cuts are part of a systemwide budget-cutting exercise in which all LSU campuses were asked to say how they would adjust to a 23 percent drop in state support.