Eggs with live embryos only are transferred to the hatcher. Depending upon the passage of light through the egg, the eggs are classified as infertile when transparent, dead germ when translucent and eggs with live embryos when opaque. In most commercial establishments, candling is done on 17th or 18th day of incubation to save labour. Although infertile eggs or eggs with dead germ do not serve any useful purpose, removal of such eggs from the incubator makes the room available for setting of more eggs. The eggs are candled from fifth to seventh days of incubation to remove infertile eggs and on 18th day to remove dead germs. ![]() Use of separate hatcher facilitates cleaning, disinfection and fumigation without disturbing other eggs. When separate hatcher is used temperature is maintained at about 98☏ and relative humidity at 70 to 80 per cent to obtain good hatch. Use of separate hatcher improves hatchability. No turning is required after 18 days of incubation. In this egg trays turn through an angle of 90°. Modem incubators are provided with devices for automatic turning of eggs at least 8 times or more during 24 hours. Eggs should be turned at least 4 times during a day when turning is done by hand. Turning or eggs in the incubator improves hatchability. Hatchability decreases when eggs are placed in the incubator with narrow end up as the embryo develops with its head in the small end.
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