The daughter of Manduro showed promise in maidens over the winter and benefitted from the step up in trip.
She travelled smoothly throughout under Neil Callan who adopted a handy position on the outside.
He rounded the final bend just behind the leader before kicking for home on straightening. Zowaina picked up well under Callan's drive to win gamely by two and a half lengths.
Roger said: "We have trained a number from her family and they have all stayed well. She has shown a good attitude and it is always good to get a win with a homebred."
Zowaina (nearside) works on racecourse side under Malin Holmberg.