To recognise breeding condition is essential if good breeding results are to be obtained. The cock bird should be bright eyed, in good feather with a bright blue cere. He should be continually active and busy in his movements.
The hen should be equally active and keen to chew your aviary to pieces, her cere should be a rich brown colour but this is not always the case.
The age at which you can safely breed budgerigars is subject to some disagreement but to be on the safe side, hens should be 12 months and cocks 10 months.