On Sat, 09 Feb 2013 13:27:08 +0000, DrTeeth wrote:

On Sat, 9 Feb 2013 12:51:13 +0000, just as I was about to take a herb,
geoff disturbed my reverie and wrote:

That's just muscle spasms

Once that bolt's through the brain, the brain is mush

It is not done with surgical precision so you can not be sure. It is
still 'barbaric'.



It does not need to be, the impact of the bolt (there are two types, one
penetrates the other does not) delivers enough energy to the skull(1) to:

a: fracture it (and penetrate if that type)
b: produce severe concussion and brain damage that in about 85+% of cases
is fatal.

All such animals are then bled by severance of the main vessels arising
from the heart to ensure death before consciousness returns (if it would
have).

Kosher/halal, there is an alternative supply in (most) bovine animals
via the basilar/vertebral artery (& the circle of willis) that can
maintain consciousness for a prolonged time of only a neck cut is made,
without first stunning the animal to render them unconscious.

(1) From what I can find/remember the cartridges used in most captive
bolt guns give a bolt velocity of ~60 m/s (around 120mph) and depending
on the mass of the bolt (about 150g) the energy it delivers is about
270KJ.

I can not find a figure for the minimum required but it is generally
accepted that velocities below about 40m/s are much less effective.

Avpx

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