Parameters To be adapted at each hatchery Hatch window target < 30h Disinfection prior hatching Plate in each hatcher at 19-20 days 500 ml of 18-20% formalin After 5% chicks hatched Evaporation Room environment Temperature : 25°C Humidity : 55-60% Air volume supply-3,5 to 4 m3 / hour / 100 eggs