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Here is an article at the start of the hatching section. Could any of these be the problem?
Sign: Dead embryos; 7 to 17 days of incubation; each embryo has egg tooth, toenails, feather follicles (8 days), feathers (11 days). Causes:
Improper incubator temperature, humidity, turning, ventilation. Low humidity increases abnormalities of aortic arches (13 days).
Contamination.
Nutritional deficiencies -- riboflavin, vitamin B12, biotin, niacin, pyridoxine, pantothenic acid, phosphorus, boron, or linoleic acid.
Lethal genes (>30 have been described).
Sign: Dead embryos; >18 days of incubation. Causes:
Improper incubator temperature, humidity, turning, ventilation.
Improper hatcher temperature, humidity, ventilation.
Contamination, especially from molds (aspergillis, etc.).
Fumigation too severe or too prolonged.
Eggs chilled in transfer, or transferred too late.
Broken shell -- pre-set, during incubation, or at transfer.
Nutritional deficiencies -- vitamin D, vitamin A, folic acid, or pantothenic acid, riboflavin, vitamin E, selenium, vitamin K, biotin, thiamin, vitamin B12, calcium, phosphorus, manganese, or linoleic acid.
Embryonic malposition; embryo fails to move into proper hatching position (see #21).
Embryological development accident. Failure to change to lung respiration and all intra-embryonic circulation, and/or to retract the intestinal loops and yolk sac. These and other changes are critical at this time.
Heredity -- lethal genes, chromosome abnormalities.
Twinning.
Hatcher opened too much during pipping and hatching.
Poor shell quality.
Breeder diseases.
Troubleshooting: Specific Problems
Sign: Not pipped. Full-term embryo, large yolk sac; yolk sac may not be fully enclosed by abdominal wall, may have residual albumen. Causes:
Inadequate turning, resulting in decreased embryonic membrane development and nutrient absorption.
Humidity too high during incubation or after transfer.
Incubator temperature too low.
Hatcher temperature too high.
Eggs chilled (e.g., at transfer).
Nutritional deficiencies.
Heredity.
Embryological development accident.
Breeder diseases.
Inadequate ventilation.
Prolonged egg storage.
Sign: Pipped. Full-term embryo, dead in shell. Causes:
Low humidity or temperature for a prolonged period.
Low humidity during hatching.
High temperature during hatching.
Nutritional deficiencies.
Breeder diseases.
Poor ventilation.
Inadequate turning during first 12 days.
Injury during transfer.
Prolonged egg storage.
Here is an article at the start of the hatching section. Could any of these be the problem?
Sign: Dead embryos; 7 to 17 days of incubation; each embryo has egg tooth, toenails, feather follicles (8 days), feathers (11 days). Causes:
Improper incubator temperature, humidity, turning, ventilation. Low humidity increases abnormalities of aortic arches (13 days).
Contamination.
Nutritional deficiencies -- riboflavin, vitamin B12, biotin, niacin, pyridoxine, pantothenic acid, phosphorus, boron, or linoleic acid.
Lethal genes (>30 have been described).
Sign: Dead embryos; >18 days of incubation. Causes:
Improper incubator temperature, humidity, turning, ventilation.
Improper hatcher temperature, humidity, ventilation.
Contamination, especially from molds (aspergillis, etc.).
Fumigation too severe or too prolonged.
Eggs chilled in transfer, or transferred too late.
Broken shell -- pre-set, during incubation, or at transfer.
Nutritional deficiencies -- vitamin D, vitamin A, folic acid, or pantothenic acid, riboflavin, vitamin E, selenium, vitamin K, biotin, thiamin, vitamin B12, calcium, phosphorus, manganese, or linoleic acid.
Embryonic malposition; embryo fails to move into proper hatching position (see #21).
Embryological development accident. Failure to change to lung respiration and all intra-embryonic circulation, and/or to retract the intestinal loops and yolk sac. These and other changes are critical at this time.
Heredity -- lethal genes, chromosome abnormalities.
Twinning.
Hatcher opened too much during pipping and hatching.
Poor shell quality.
Breeder diseases.
Troubleshooting: Specific Problems
Sign: Not pipped. Full-term embryo, large yolk sac; yolk sac may not be fully enclosed by abdominal wall, may have residual albumen. Causes:
Inadequate turning, resulting in decreased embryonic membrane development and nutrient absorption.
Humidity too high during incubation or after transfer.
Incubator temperature too low.
Hatcher temperature too high.
Eggs chilled (e.g., at transfer).
Nutritional deficiencies.
Heredity.
Embryological development accident.
Breeder diseases.
Inadequate ventilation.
Prolonged egg storage.
Sign: Pipped. Full-term embryo, dead in shell. Causes:
Low humidity or temperature for a prolonged period.
Low humidity during hatching.
High temperature during hatching.
Nutritional deficiencies.
Breeder diseases.
Poor ventilation.
Inadequate turning during first 12 days.
Injury during transfer.
Prolonged egg storage.
