egg size

How exact in size should dummy eggs be? I ordered a set of dummy eggs for my prolific ringneck dove pair. Yesterday she laid an egg and I swapped it for a dummy egg. However, I was then able to notice the size difference. Is the larger dummy egg still going to fool her? Or does it not make...

Would crossing different strains of pigeon cause a different egg size? I have 2 satinette hens that both just layed eggs. I recently squired the birds ad one of them had been housed with homers so there is a very slight chance the eggs are fertile. One egg is a lot larger than the others, could...