Probable Cause Corrective Measures Improper incubation temperatures Follow recommended incubation temperatures. High hatching humidity Maintain proper humidity. Navel infection (Omphalitis) Clean and disinfect incubator and hatching units between settings of eggs. Maintain dry hatching trays. Properly store and fumigate eggs.

Troubleshooting: General Problems

Sign: Eggs candle clear; broken out eggs show blood ring or small embryo that died before 3 days of incubation; no dark eye visible. Causes:

1. Eggs stored too long or under improper temperature.

2. Fumigation improper -- too severe or done between 12 and 96 h of incubation.

3. High temperature in early incubation.

4. Low temperature in early incubation.

5. Eggs damaged during transport by jarring, etc.

6. Breeder flock diseases.

7. Old breeders.

8. Embryological development accidents.

9. Inbreeding, chromosome abnormalities.

10. Severe nutritional deficiencies, e.g., biotin, vitamin A, copper, vitamin E, boron, or
      pantothenic acid.

11. Frequently associated with a high incidence of infertility.

12. Drugs, toxins, or pesticides.

13. Contamination.

14. Embryos less developed at oviposition, i.e., pre-endoderm or very early endoderm
      formation.