Let me clarify a couple of misconceptions you have.
1. Can birds breed all year round? Yes, they can but only when they are exposed to breeding triggers all year round and this only happens in captivity because we control 100% of their environment. It never happens in nature. NEVER. In the wild, birds have a resting season (in temperate climates, it corresponds to the winter). But there aren't two seasons, either. Birds take a number of weeks to achieve full breeding condition and these weeks are spent in courtship and nest building. Then comes the laying, incubating and raising of young. There could be one or two clutches per breeding season but, after them, most birds go into molt (this is where we are now, in molt) and then into the resting season as the days get shorter and the food supply dwindles or the weather turns inclement (even in the tropics, the birds have seasons).
2. Does taking the nest box automatically stop the process? No, it doesn't. It helps because having an adequate nest is a breeding trigger but it doesn't stop them overnight. In order for birds to stop producing sexual hormones, you need to keep them at a solar schedule, exposing
them fully to dawn and dusk because this will tune their bodies to the local seasons and allow for all their biorhythms to be in synchronization with nature, as they evolved to be. When you have birds that have been kept at a human light schedule (lights on before the sun is out and after it sets), it takes longer because the endocrine system is screwed up and it takes a while for it to go back to where it should be. Just to give you an idea, I once took in a 9 year old show and breeding female lovebird (a gorgeous lutino longfeather which had won every single show she had been entered in three states) that had become a chronic layer and it took me an entire year to get her back in tune with the seasons. It was that gradual.
3. I am not a parrot breeder and, as far as I know, there are no breeders on this board. I breed canaries (Spanish Timbrados) on occasion and have been involved in bird keeping for over 50 years, in parrot keeping and breeding canaries for over 20 and I do a lot of research so I've learned a bit about bird husbandry and it's this experience and learning that I share with others here.
4. You took offense to my telling you 'to do yourself and your birds a favor' but you said you had mourned the loss of your previous female, a death that was directly caused by your lack of knowledge in birds physiology (I've never had a single chronic or off-season layer or an eggbound female in the 24 years I've been breeding canaries), a lack that did not appear to have been corrected because, going by your posting, you are trying to breed off season and with a hen that only 5 months ago was in bad shape. This is recipe for heartache, my dear. Your heartache. Birds don't get to be in top shape 5 months after been in bad shape. Good breeders (not everybody is a good breeder) will tell you that the bird needs to be not only physically mature (and that means 2 years old -their second season- because although small species are sexually mature at 8 months of age, to breed them on their first breeding season would be like allowing a 12 year old girl to have babies) but also in excellent shape. Again, just to give you an idea of what I mean, when I buy a canary hen I plan on breeding, I acquire her, at the very least, 6 to 8 months before the next breeding season because you need to know FOR A FACT that she is not only 100% healthy but also that she has had an excellent diet and supplements (like calcium and D3) for quite a while as well as 6 months of flying prior breeding (they need to fly to develop the muscles they use for laying).
Now, the endocrine system does not have an on/off switch so everything takes time and, when you are talking about a system that has been overworking for months, you need to give it time to go back to where it's supposed to be so putting them on a strict solar schedule would, sometimes, appear not to work but it does, you just have to be patient about it. There is no need to separate them (I would never recommend splitting up a bonded pair, it's cruel) but reducing protein intake (no parrot should be free-fed protein, it's unnatural and completely unhealthy) and taking away the nest box will help with the process because both are secondary breeding triggers.
Their having sex does not mean the bird is going to lay an egg (birds are truly exceptional that way in that the hen can store the male's sperm for up to nine days and chooses whether to use it for fertilization or not -they also decide which sex the babies are going to be -amazing animals, aren't they?). So don't worry about that. Let them have their fun.
I also do not believe in preventing natural biorhythms. I think, as you do, that it's not only natural but also healthy for them so I not only do not prevent them from having a breeding season, I actually encourage my birds to chose a mate and go through all the motions of breeding so they court, nest, lay and incubate - but I don't allow babies to be born (I rescue parrots so I am against breeding them) so I switch the real eggs with fake ones the same morning they are laid (there is no embryo in them at that point in time) and, this way, everybody is happy because birds do not anticipate the birth of babies from eggs although they do mourn the babies that die or that are taken away from them (parrot breeders do this all the time and I think it's one of the cruelest of animal husbandry practices).
Therefore, if I were in your shoes, I would:
a) leave them together
b) remove the nest box
c) if they are not already in one, put them in a large flight cage (the change will distract them from breeding, too)
d) reduce protein
e) put them under a strict solar schedule
Let me know if you have any questions.





