Variables in Hatching
Why Hatch Rates Vary — Even With Fertile Eggs
Many customers are surprised to learn that incubation conditions have a major impact on hatch success.
1. Temperature calibration matters more than most realize.
Most backyard incubators run 0.5–1.5°C off their display reading. Even small temperature deviations over 21 days can significantly reduce hatch rates.
2. Humidity balance is critical.
Too much humidity early in incubation can lead to underdeveloped air cells. Too little can cause shrink-wrapping during hatch. Both reduce successful outcomes.
3. Turning consistency is essential.
Eggs must be turned regularly during the first 18 days to prevent the embryo from adhering to the shell membrane.
4. Resting eggs after transport is important.
Shipped or transported eggs should rest point-down for 12–24 hours before incubation to allow the air cell to stabilize.
5. Storage conditions before setting matter.
Eggs stored too warm, too cold, or laid flat prior to incubation may experience reduced viability.
6. Thermometer placement affects accuracy.
Air temperature inside the incubator is not always the same as temperature at egg level. Proper placement is key.
Incubation is often assumed to be simple, but small variations in setup can produce large differences in hatch results.