For the MOST healthy and happy breeders, it is ultimately best
to start around 18-24 months, preferably 24 months. This
ensures that the parents are completely done growing and have
all the vitamins store up to pass on to the chicks, and you'll
also have a higher success rate with the chicks and less chance
of deformity (granted the parents are healthy). If you breed
them only once a year they can breed longer than if you breed
them twice a year.