It is also a good source of calcium. They are very manageable, and can be very sweet. The males have more of a tendency towards talking. When I use to raise cockatiels, one of males use to sing all these songs he knew to get the female into the nest box. I am joking to all the men out there.
Cockatiels are easy birds to raise.
But, I caution any one going into breeding, that there is not a lot of money to be made out there on raising birds, especially raising cockatiels. Plus there are so many people out there raising cockatiels. I think I just broke even if that. One must really love the hobby, and not out there to be making a buck. One thing I love about the cockatiel is the mutations.