Causes:
- Eggs held too long before setting, even under good conditions, or eggs held at length of time at improper levels of temperature and/or humidity.
- Eggs chilled before setting.
- Improper turning or setting
- Inadequate ventilation
- Abnormally high or abnormally low incubator temperature.
- Insufficient moisture.
- Damage to eggs in shipment caused by jarring or shipping them with large end down.
- Eggs from poor quality stock.
Correction:
- Try not to hold eggs more than seven days if at all possible and then only if holding conditions are ideal.
- Gather eggs quickly, cool properly before casing, and hold under proper conditions.
- Provide adequate ventilation of the incubator room and proper openings of the incubator ventilators. Do not recirculate air. Supply 100% fresh, tempered air.
- Maintain proper temperature levels throughout the incubation cycle.
- Maintain proper humidity levels throughout the incubation cycle.
- Hatching eggs must be shipping good quality, well-protected egg cases or equivalent, with small end down. Avoid rough handling
