Poultry International - July 2017 - 30
30 ❙ PoultryInternational
How to maintain broiler carcass
quality during evisceration
Ensuring the best possible evisceration starts with feed withdrawal,
but comprises the proper completion of several processing activities.
EDUARDO CERVANTES LÓPEZ
Several factors can contribute
to how successfully broilers are
eviscerated during poultry processing, and consequently the processing plant's final yield.
Broiler management prior to arrival at the plant, and the care with
which evisceration is carried out
can make the difference between
meeting and failing output targets.
Ensuring good evisceration
starts with making sure the feed
withdrawal period is properly man-
Full crops increase the risk of
Eduardo Cervantes López
aged, if the following problems are
to be avoided.
Short feed withdrawal
If the feed withdrawal period
prior to slaughter is too short, this
can lead to several issues which will
affect the evisceration operations.
Unlike humans, chickens do not
have a diaphragm. If the withdrawal period had been too short, any
remaining ingested feed will, when
the birds are hung on the overhead
conveyor, exert pressure on the
esophagus, preventing the chickens
from breathing properly.
This will result in wing flapping,
particularly in the bleed tunnel, and
the resultant damage to carcasses
can lead to them being rejected.
An overly short feed withdrawal
period can also result in feed still
being in the crop after the broilers
exit the last plucker, increasing the
risk of internal carcass contamination. Should the crop break, any
remaining feed will escape. Some
will adhere to the abdominal cav-
ity fat and be impossible to remove
during reprocessing. Contaminated
carcasses will have to be either partially or completely rejected.
This type of contamination can
have a significant impact on yields.
It is also worth remembering
that when intestines are full of feed,
they will tend to lie closer to the
vent. When the latter is removed,
the intestines may be accidentally
cut, resulting in internal and/or
external carcass contamination, resulting in birds being sent for reprocessing or being rejected altogether.
Long feed withdrawal
If the feed withdrawal period is
too long, intestines will weaken due
to dehydration, and the risk of them
splitting and fecal matter escaping
rises. This is of particular concern
during vent and intestine removal,
and fecal matter on carcasses may
lead to them being rejected.
Removing the gallbladder
A broiler's gallbladder will
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