The Splendid Bourke Bird Blog: Question on Why Eggs Don't Hatch...

Using a book light to candle eggs.
Checking to see if they're fertile or not.

We've covered this topic before, but it's worth addressing again. The question below arrived in email today, and is copied here just as it was written.

"Hi There, I have a pair of bourse hen lays eggs try to hatch but no babies come out this is her second clutches. Please let me know the reason and its remedy. Thank you"

Our Answer:

Hello Jenny, Are you sure you have a male and a female Bourke? It takes two. Sometimes two hens might act like a pair, but they won't have fertile eggs. Or, sometimes a young pair fail to mate successfully. The hen must stand very still, and the male must balance adequately on her back. He carefully bends his his tail under her for their vents to make contact in order to be successful. Some males have to expand their wings for balance, so potential parent birds should not have their wings clipped.

If you have birds of each sex for sure, then maybe with more practice they will eventually succeed. If you are certain the eggs were fertile, but still did not hatch, perhaps they got cold. Or, maybe the hen doesn't have water she can bathe in. Hens have to be able to adjust the nest's humidity, especially if the weather is hot and dry. A place to bathe in is important, but do NOT spray or mist a hen yourself. Let her decide how much humidity is necessary.

Less likely is that the babies inside the eggs have some genetic defect, but that is only likely to happen with one bird, not all of them.

Those are some of the most likely possibilities. If you have two birds of the opposite sex, and the male is feeding the female, then eventually they will probably succeed at mating. Meanwhile, don't remove infertile eggs until the hen actually abandons them herself. Hens learn from the fact that their eggs didn't hatch, and are more likely to have fertile eggs in the future. Removing them yourself is not wise. Eggs are due to hatch in 18 to 25 days, but only after they've been warmed by brooding. If she's frightened off the nest too soon, they could get cold and not hatch. She should be allowed to abandon them herself, usually after 25 days for a Bourke hen. Good luck.