How many days can you keep a fertile chicken egg and still hatch?

Chicken eggs can remain fertile and viable for hatching purposes for a period of up to 10-12 days when stored under appropriate conditions. After this time, the chances of successful hatching decrease significantly due to reduced embryo viability and increased risk of bacterial contamination.

To maintain egg fertility and increase the likelihood of successful hatching:

1. Optimal Storage Temperature: Fertile eggs should be stored at a consistent temperature between 55-60 degrees Fahrenheit (13-16 degrees Celsius). Avoid extreme temperatures, as excessive heat or cold can negatively affect embryo development.

2. Humidity Control: Eggs require a high humidity environment to prevent excessive moisture loss and maintain optimal conditions for embryo growth. Keeping eggs in closed containers with a humidity of around 50-60% is recommended.

3. Egg Turning: Regularly turning eggs helps prevent the embryo from sticking to the shell and ensures proper development of internal membranes. Eggs should be turned at least 2-3 times daily, ideally every 4-6 hours.

4. Candling: Candling, or illuminating eggs with a light source, can help detect infertile or damaged eggs. Infertile eggs will appear clear, while fertile eggs will show the development of blood vessels and the embryo. Candling can be performed after a few days of incubation to identify and remove non-viable eggs.

By adhering to these guidelines, the fertility of chicken eggs can be maintained, and the chances of successful hatching can be improved for up to 10-12 days after they are laid.