TIRUMALA: Tirupati Devasthanams (TTD), as part of its plan to introduce rotis in its Annadanam for North Indian pilgrims, will take up a trial run from Wednesday. The TTD will introduce rotis in employees' canteen to get feedback about the quality of rotis prepared by roti machine. Roti serving will be inaugurated by President Pratibha Patil on June 7 and 8.