The most fragile period for the eggs is the first 3 days and the last 3 days. During the first 3 days, the embryo is just starting to develop, as well as the vein network. It is not advised to handle them at all during this time as the vein network is very fragile and can become twisted causing damage to the embryo. During the last 3 days handling is not advised due to the chick positioning itself within the egg to hatch, as well as keeping a steady environment for hatch to be successful.
Optimal candling days are 7, 14 & 18. I usually only candle on day 14, where you are certain if a chick is growing or not.
Jody
Optimal candling days are 7, 14 & 18. I usually only candle on day 14, where you are certain if a chick is growing or not.
Jody