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Piped eggs might not hatch due to the following reasons:
- Eggs have been stored for too long or at too low or too high a temperature before incubation.
- Improper setting of eggs in incubation trays with the small end up.
- Wrong turning angle of the egg in the incubator
- Improper incubation parameters: too high or too low temperature or humidity or insufficient egg turning during the incubation period.
- Improper ventilation during any or all of the incubation period, and especially during hatching.
- Improper nutrition of breeders: the use of mouldy feed or feed lacking micronutrients
- Parent flock is diseased (Samonellosis, Mycoplasmosis, Collibacillosis)
- Inbreeding can cause weak chicks resulting in higher pips.
- Rough handling when eggs are transferred from the incubator to the hatcher can cause mal-positioned embryos that will pip but not hatch.
- (Eggs should be put in one layer in hatching trays of not high density to allow the eggs to rotate during piping).