User's Manual

MJ192 GB Issue 02
13
1) Clear when candled -
probably infertile (or very
early death) when candled at
8 days
2) Fertile with red blood
vessels - after 8 days
3) Red or black staining -
early death when candled at 8
days
4) Embryo with red blood
‘ring’ - early death when
candled at 8 days
5) Dark outline with ill
defined detail - late death (10-
16 days)
6) Live embryo with bill in
air sack - due to hatch in 24-
48 hours
7) Normal development of
the air pocket according to
number of days
13.4 General guides:
Observation Likely Cause(s) Solution(s)
No chicks hatch Infertility, infection, drastically
incorrect incubation settings,
parent ill health.
Check egg viability – are
similar eggs hatching naturally.
Disinfect the incubator. Check
incubator settings and
procedures – particularly
temperature.
Chicks hatch earlier than
expected, deformities.
Incubation temperature too
high
Reduce incubation temperature
slightly 0.5°C (1°F)
Chicks hatch later than
expected
Incubation temperature too low Raise incubation temperature
slightly 0.5°C (1°F)
Hatch dates widely spread Different rates of development
due to different storage times,
incubation temperature
variation.
Limit egg storage times. Check
for incubation temperature
variation – sunlight, large room
variation etc.
Late stage ‘death in shell’ Incorrect humidity, probably
too high.
Try reducing average humidity
levels (but see section 6 above)
Generally poor results Incorrect incubation settings,
poor parent bird health,
inadequate egg turning,
Improve parent bird health,
check all incubation settings,
analyse egg weight loss to
confirm humidity correct,
check turning working
correctly.
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