At times it becomes necessary to care for chicks from day one. The most common reason for this is poor parenting instincts in the breeding pair. The parents are often young and inexperienced. Most breeders recommend waiting until the female is 16-18 months old and the male at least 12 months old before breeding them.
Parental instincts seem to kick in more readily with maturity.
Another reason for the need to care for day one babies is abandoned eggs. This may be a result of poor instincts or because the parents were disturbed to the point of abandoning the nest box. Living in Southern California allows me the luxury of having my birds outside year round. Because I live near the coast, the temperatures stay fairly consistent all year. This allows me to breed throughout the year.