I am not really sure why you would want to breed them anyway if you dont really want to. There are a lot of risk involved. You dont need to. Just dont give them the opportunity. If you dont provide a nestbox they (usually) wont breed.
If you do, however, make sure the birds are in mating condition. Be sure the female is at least 12 monsth of age or risk her dying becouse one of the eggs isnt able to pass.
Make sure you have enough calcium available.
Make sure there is enough water and food available.
Make sure there is enough vegetables, vitamines, minerals ect available.
Dont mate them while they are molting.
I'm really leaning toward not giving them a nest box, because I'm terrified of all the complications and it's just not worth the risk. She seems to be trying to find anything to make a nest out of though, despite my best efforts at stopping her. When she's out, she goes in tissue boxes. She'll pull wicker out of baskets. She'll forage for anything that she could possibly make a nest out of and get a small one going before I take it away from her.
Really, I just want to be prepared in case she does decide to lay eggs despite my best efforts. I'd rather be prepared and know what to do in case the situation arises than be looking around for answers after it's already happened, you know?
They have a cuttlebone and a mineral block. Their food and water is changed twice daily. They get fresh and dried fruits and vegetables daily, even if they refuse to eat it and push it to the side to eat the seed under it.
I really just want to make sure nothing goes wrong if I can't prevent her laying eggs. She seems pretty darn determined.
"Mockingbirds don't do one thing but make music for us to enjoy. They don't do one thing but sing their hearts out for us. That's why it's a sin to kill a mockingbird."
- Harper Lee, To Kill a Mockingbird