There could be various things that can lead to infertile eggs. Females without mating with makes can still lay eggs and will be infertile due to its surrounding habitat.I don't really understand how and why it happens and if it's normal or not. My cockatiel is female and hasn't laid any eggs. I've had her for almost 2 years now..
Wow thank you for your explanation! I was getting worried because I thought it was a bad thing if she doesn't lay somw infertile eggs but I'm glad to know she'll be ok!Some hens will lay eggs without a mate and some will not. It depends on how hormonal they are. Be glad that your girl isn't laying eggs. Infertile eggs would be a useless drain on her body's resources, and a threat to her life if she had problems with egg binding.