The hatch stage
refers to the final 2 days to 3 days of incubation.
Chicks hatch out of the shell during this
stage. Do not turn the eggs during the last 3 days
to 4 days of incubation. Transfer eggs to
a dedicated hatcher at this time. If a hatcher
is unavailable, remove the eggs from the turner and lay
the eggs in the hatching basket or place
on cloth or rough paper (not newspaper) in the incubator.
Make sure that the paper does not obstruct airflow, contact
the water, or contact the heating element. Temperature
should remain at 99.5 degrees F and increase the humidity
to at least 90 degrees F wet bulb. Humidity can be increased
by adding either a wet sponge or wet paper towels to increase
the evaporative surface in the incubator.
When Chicks Hatch:
The hatching process requires great exertion
by the chick. The chick progresses through
periods of activity followed by lengthy periods of rest.
The entire hatching process requires 10 hours
to 20 hours. Do not be concerned about the time a specific
chick requires to hatch unless the process
exceeds 20 hours.
Once chicks successfully leave the shell they
should remain in the incubator until their feathers
are dry. Ventilation should be increased. When more
than 90 percent of the chicks are dry they should
be removed from the hatcher. Excessive time in
the incubator can dehydrate chicks. Remove chicks to
a warm brooder and provide them with water and feed.
Eggs that remain unhatched for 1 day beyond
the predicted incubation period should be discarded.
Attempts to help a chick free itself from the
shell often are unsuccessful. Chicks too weak
to hatch themselves usually do not live. If they
live, they usually will not thrive. Dispose of weak
or deformed chicks humanely. These chicks
should never be used for breeding purposes because these
traits could be transmitted genetically to their young.
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
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