WATT PoultryUSA - January 2018 - 26
26 ❙ WATTPoultryUSA
GOOD POULTRY MANAGEMENT
head into the electrified water.
The bird's head must fully enter
the water bath as, if not, brain activity will be less profoundly disrupted.
Heads should pass within 5 centimeters of the bath's immersed elec-
trode, which must run for the bath's
entire length for a consistent amount
of current during the entire time that
birds are in the electrified water.
It is better for bird welfare if electrical frequencies of between 50 and
Minneapolis Convention Center
March 13-15, 2018
Join us for the 2018 Midwest Poultry
Federation (MPF) Convention in our new home - the
Minneapolis Convention Center!
We have plenty on tap, including a brand-new Student
Careers Program, a special Entertainment Event with
Sawyer Brown, and a revamped schedule to allow for
more time on the Exhibit Floor!
200 hertz are used, as data modeling
suggests that the chance of successful
stun reduces progressively as frequency increases, even if the current
amplitude is also increased.
An individual bird's resistance is
highly variable relative to other birds
of the same type, as well as between
breeds and species, and therefore the
voltages required to achieve recommended currents may differ significantly between bird types.
After stunning, a bird's throat
should be cut as soon as possible,
and the throat muscle must be cut
into to sever both carotid arteries.
Alternatively, decapitation is an
acceptable method for bleeding a
stunned bird. Ideally, birds should
be bled for 2-3 minutes before further processing.
Of the large-scale slaughter
methods, the electrical water bath,
followed by neck cutting, is the most
common, but use of gas stunning
is increasing, and interest in this
method is growing, Spence said.
For gas stunning, the most commonly used gases are carbon dioxide, nitrogen and argon, which are
delivered in a variety of ways, at a
variety of concentrations, and for a
variety of durations.
Exposure to low, gradually increasing, concentrations of carbon
dioxide has been suggested by some
to be better for poultry welfare, but
respiratory effects, such as head
shaking and open bill breathing, are
Visit us at IPPE, booth B8028
www.WATTAgNet.com ❙ January 2018