I also have a Bourke's and I purchased him from a private breeder who gave him primarily pellets and millet. I have done a bit of research on them and most articles suggest that a good quality pellet contains all of the nutrients that they need. I was also told that more often than not people opt for seeds because they are generally less expensive, easier to find and picky eaters may be resistant to the pellets. I use Zupreen Natural Daily Bird Food and Harrison's High Potency Mash with millet as a treat. I hope that this is helpful.