Nature
Starting position
Turning during storage
Turned
If the eggs are only stored for a few days, turning is not really necessary. Eggs stored for more than 7 days should be turned preferably every hour during storage, but rotated at least several times (2-4 times) a day through an angle of 90° (tilting from -45° to + 45°). On the trolley, this must be at least 35°. The main reason for turning eggs during storage is to prevent the membranes adhering to the inner shell membrane and the yolk from floating against the air cell. During incubation, turning is important for normal embryonic development (distribution of fluids inside the egg). If the eggs are going to be stored for longer, an egg temperature treatment (SPIDES) will also be necessary.
Final position
Starting position
pr ot
ec
te
d
Incubator
Turned
Final position
co
py
rig
ht
Turning ensures that the yolk is always positioned with the germinal disc facing upwards. During natural incubation, the hen moves the eggs so they roll and tilt. In an incubator this is done by mechanically adjusting the angle.
The eggs are turned regularly during storage. The turning angle is normally between 35–45° relative to the position of a horizontal tray.
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The trolleys in the storage room are coupled to an automatic turner.
Ha tc he ry S i gnal s
