So, I guess(?), duck and quail eggs are available (but people actively breed both and would have eggs….) but I know that turkeys and geese have a breeding season. Also, wild birds only lay fertile eggs in season to reproduce.
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They have been bred to do so. They are so-called “indeterminate layers”, they will continue laying eggs until their clutch is complete. This in contrast to species that are “determinate layers”, which lay a fixed number of eggs. If eggs are removed from the clutches the hens want to form, the hens just continue laying. Obviously, in nature they wouldn’t be able to lay eggs for month after month, here breeding comes into play. EDIT: The reason eggs are unfertilized is because no rooster is present. The hen starts producing the egg not knowing whether it will be fertilized and needs to lay the egg once formed.
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