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).