Is animal stunning allowed for Zabiha ?
Desensitisation,
or stunning

No
injury shall be inflicted on the animal’s nervous system,
brain or spinal cord prior to slaughtering. ( Please refer to Halal Nullification
)Shooting a bullet in the
head,
captive bolt, hammering the head to stun, electric shocks, stunning by
carbon
dioxide, and such procedures before slaughtering are questionable and
thus
subject to Ijtihad
The
question is: “If no injury can be inflicted on the
animal to be slaughtered, what about stunning? Will it render the
resulting
meat (upon slaughter) Halal
in the eyes of the Syariah?”
Muslim
slaughterman shall recite the phrase prior to
switching on the mechanical knife. Such invocation during the course of
slaughtering is a unique feature of Islamic
slaughter. Absence of such
invocation will render that particular meat Haram,
thus not lawful to be
consumed by believing Muslims.
The
Muslim
slaughterman shall not leave the slaughter area
during the production process. However, when there is a need to leave,
the Muslim
slaughterman shall be replaced by another Muslim
slaughterman. The
former shall stop the line and switch off the mechanical knife. To
restart the
production process, the 2nd slaughterman shall recite
“Bismillah, Allahu Akbar”
before switching on the mechanical knife and line.
In
case of Chicken, ducks and bird slaughter using a rotary
mechanical blade, there must be three Muslim
slaughtermen present. One
slaughterman touching the birds physically before they go into the
rotary
cutting blade reciting name of "Allah"
and the two Muslim
slaughter
men are to slaughter the birds that were missed by the blade.

Desensitisation, or stunning,
of the subject before
slaughter remains a debatable issue. However, most Islamic
scholars
have come
to terms and agreed that stunning is acceptable and thus the meat is
Halal
for
Muslim
consumption. There are a
number of forms of stunning and in some forms,
the animal will remain unharmed and can actually get up and walk away a
few
minutes later if it is not slaughtered . Furthermore, stunning is an
effective
mass production technique that provides a means of controlling the
slaughter
more precisely, thereby avoiding undue stress to the animal and the
slaughterman. As a whole, from
these conditions, it is obvious that Halal manners are
determined in fine
details, and that the slaughterer has to be careful to clear all of
Halal steps.
From this standpoint, the concept of Halal in Islam is quite unique in the
world.