Principle of incubation

a) Temperature:

• Embryo start developing when temperature is > 24⁰
• High temperature cause mortality of embryo, smaller chicks, lack of alertness, etc.

b) Humidity:

• For Ist 18 days: 55-60 % and for last 3 days: 65-75%.
• Low humidity : Piped egg, dead embryo.
• High humidity: Delay hatch and reduced hatchability.

c) Ventilation:

• For every 1% drop of Oxygen, there is 5% drop in hatchability.
• Requires high air circulation in 21^st day of incubation. So, requires high ventilation.

d) Position of egg:

• Large end up and small end down.
• Horizontal position in case of natural behavior.

e) Turning of eggs:

• Several times a day ( 4-6 times a day)
• From 3^rd day to 18 days of incubation.
• As gentle as possible.