To be honest, not all birds will be good breeders. If the pair has not been rested in between each attempt, then as soon as these eggs are abandoned or past due, please take down the nesting box for about 6 months. This will force the pair to take a break from breeding.
Breeding birds take a lot of patience and there are many things you need to provide or do to give them a better chance of success. Your birds need to be old enough – the male should be at least a year old, and the female 18-24 months old. Young birds may be capable of breeding, but they are still too immature to settle down and take care of eggs and chicks. Your birds must be on a nutritionally balance diet such as pellets or our foraging diets – a loose seed mix will not provide the nutrition they need. When they are set up for breeding, you should also offer dark leafy greens, chopped veggies, multi grain bread and cooked eggs, with the shell cleaned, crushed and cooked with the eggs. The eggs and eggshell are important because they provide protein and calcium for the female, but this should only be fed when they are getting ready to breed and until the chicks are weaned. A cuttlebone is also good to have for the female. Your birds also need privacy – they should be away from people and other pets when they are breeding and hatching eggs, and feeding chicks. If there is too much activity around them, they can get too nervous to stay inside the nest box. If you check on them too often or disrupt them by cleaning the cage, they will abandon the eggs or even chicks. When they are set up for breeding, only go near the cage to feed them. Never clean the nest box while they have eggs or chicks. Try this after they have rested for 6 months and see if they do better. If they still fail to sit on the eggs, then I would remove the nest box and not try to breed this pair again. They may simply not interested in caring for eggs and chicks, which does happen with some pairs. It is not good to let a pair keep failing – laying eggs is hard on the female and once it becomes clear that they aren’t good at tending to their eggs, it’s best to stop them from breeding anymore.
Thank you for asking Lafeber,