User's Manual

MJ192 GB Issue 02
9
Typical ideal weight losses for species groups:
Poultry 13%
Waterfowl 14%
Egg weight loss chart
54
56
58
60
62
64
66
68
2 5 8
11 14 17 20
Incubation period (days)
Average egg weight
(grams)
Ideal weight (grams)
Measured weight
(grams)
Of the two methods given above the most reliable is egg weight method and is recommended – particularly
where poor hatch rates are experienced or if eggs of high value are being incubated.
Alter the setting of the ventilation control (reduce ventilation to increase humidity) and add water to the
evaporation tray to change the humidity level. Humidity levels may be further increased by fitting the
evaporation block as shown.
8.3 In all cases the humidity for hatching needs to be high. Because of the short duration involved water/weight loss
will not be significantly affected. High humidity is necessary to prevent membranes drying and hardening before
the hatch fully emerges. Humidity will naturally increase as the first eggs begin to hatch and internal membranes
begin to dry. This effect is in addition to the increased area of water evaporation from the evaporation block.
Water Evaporation
Tray
Eva
p
oration Block
INCREASE VENTILATION
REDUCE VENTILATION