Male parrots are infertial, it's the females that can still breed. These are cross breeds so there are plenty of health problems. What exactely is used is a close kept secret. But some south americans can cross over. i think the parrots have convict in them ,,just from the shape of the body.
But when i look a ththeir mouths, i see some serverums in them. Anyway, all reports say the males are not fertila, only the females.