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Embryo Mortality:
Unsuccessful hatches can
be caused by infertile eggs or embryo mortality.
Each of these conditions can be diagnosed after candling
and after hatch. Examine eggs that do not
hatch to estimate whether infertility or embryo
death is the basis for hatch failure. Keep records of
the time of embryo death; such records can suggest changes
in husbandry that can increase profitability.
Embryo death predominately occurs at two periods during
incubation: within the first 3 days of incubation
and within the last 3 days immediately before a hatch.
Early embryo death occurs during formation of embryonic
organs. Of all the eggs determined to be fertile by
candling at one-third of incubation, 88 percent
to 93 percent should continue to develop.
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Death immediately before a hatch occurs during
the transition between living in an egg to living
on the outside. The chick can have difficulty
positioning for pipping, absorbing the yolk sac, or
changing to breathing air. Sometimes humidity control
can be implicated in some of these problems. An overall
hatch of more than 85 percent to 90 percent can
be achieved. Collect and examine all unhatched eggs
to determine the cause of hatch failure.
An appropriately developed chick within the egg
will show certain characteristics. Normally the head
is under the right wing. The air cell will be large
enough to allow the chick to position correctly
for hatching. The shell membranes should not
dry to the chick during hatch. Note any dryness.
Note the condition of the beak, wings and legs for proper
form. All abnormalities should be recorded and analyzed
to determine if hatch failure resulted from fertility
or environmental problems that can be corrected by changing
management procedures.
Use the "Hatchability and Mortality Record"
to calculate the percentage fertility, percentage hatchability
and percentage of total eggs hatched. These numbers
will help in evaluating hatch efficiency. Any
change in these figures, or a change in the distribution
in mortality records are early warnings to correct small
problems before they become serious.
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Stages in chick embryo development
 Chick embryos that have been incubated for approximately 48, 72 and 96 hours after fertilization will be available for you to examine. However, specimens of similar ages post-fertilization may show a wide variation of maturation stages. The incubation times provide only an estimation of how far development of the embryo will have progressed. The temperature of incubation (which may be different among eggs depending on their locations within the incubator), as well as the rate of growth of the individual embryo itself will affect the overall ..... More Description about incubation periods, sizes, eggs in clutch
Valuable Information For The Beginner To The Most Advanced Breeder (Collection of Books, videos, etc)
Incubator setting for parrot/parakeets
Click
here to View total Incubation time to Hatch, time for transfer
to hatcher, Dry and Web bulb temperature for common bird:
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Grouse, Guinea, Lovebird, Macaw, Mynah Parakeet, Budgerigar,
Parrot, African Grey, Chukar Partridge, Peafowl, Ptarmigan,
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