In reply to Timmd:
Right, I'm going to go through that article pice by piece, but focussing ONLY on the stunning at slaughtering aspect - not the rearing of the animals up to the point of slaughter. I will also be focussing mainly (all figures) on the slaughter of cattle.
Then at the end of this, I'm going to post a link to a video of an animal being slaughtered by a halal method, and if I can find one, a video of an animal being stunned.
I'm not going to pretend I am un-biased, I am STRONGLY against halal slaughter, but my reasons are from first hand experience and also backed up by science.
Muslims and Jews are against stunning as it's seen as cruel, unnecessary and unhygienic
Secondly, there is nothing kind in stunning
Focussing on electrical stunning (as this is the kind referred to in the article):
i) Stunning is defined as:
"...immediate loss of consciousness which lasts until death..." according to the The Welfare of Animals (Slaughter or Killing) Regulations 1995.
ii) it is known that the brain cannot perceive a painful stimulus until 150ms after the application of the stimulus. It is also known through EEG analysis of bovine brains at the time of stunning that the animal is rendered unconscious within 15-20ms, and global epilepsy is achieved within 200ms when using head only electrical stunning. So the animal is unconscious roughly 10x faster than it is able to perceive the pain of stunning.
iii) Following the stun, the animal will experience a tonic phase of epilepsy, where all muscles contract. This results in the forelimbs extending and the hindlimbs flexing. This phase lasts for approximately 10 seconds. Following the tonic phase there is a clonic phase which is characterised by uncontrolled physical activity (the kicking and flailing phase that is so often, yet wrongly, associated with suffering). During both these phases the animal is totally unconscious and therefore unable to perceive any stimuli - including pain. The ONSET of recovery begins 37 seconds following the stun.
iv) The average time taken for loss of brain function following exsanguination in cattle is 17 +/- 4 seconds. Taking the 37 seconds until the onset of recovery 37-(17+4)=16 seconds. As a result the stick (act of severing the blood vessels) must occur within 15 seconds of the START of the stun, to ensure death before recovery can begin. It is worth noting that the 17 seconds is only achieved if both the carotid arteries and both jugular veins are cut. If only one carotid artery and one jugular is cut time to death (in sheep - I don;t have access to cattle times) increases to 70 seconds. If both carotids remain intact, but both jugulars are severed (a very poor stick may result in this) then time to death increases to 298 seconds.
So I hope from the above you can see that a) stunning itself is NOT painful, cruel or inhumane. b) that in the case of both stunned and not stunned animals the skill of slaughter-man giving the stick is key. If a stun and the stick is carried out correctly then the act of slaughter is non-painful.
This is in stark contrast to a stick in an animal that has not been stunned. I'm not going to go into the evidence that cutting an animal causes pain as I like to think that everyone reading this will realise that is true.
As the the claim that stunning is unhygienic, I assume that related to the claim that:
For example, having blood remain in the carcass of the animal is common within meat that is stunned .
This is simply incorrect. As we have just seen electrical stunning is recoverable (hence the section about time to stick). An animal would not be able to recover if its heart had stopped after the stun, so the heart must still be beating. As the heart is still beating in both stunned and non stunned animals there will be no difference in the effectiveness of exsanguination and hence the volume of blood left in the carcass. Ignoring the fact that blood is not viewed by the majority to be unhygienic.
So, I'm sorry, but the views in that article and the views held by ANYONE who states that stunning is cruel are ill-informed. There is no doubt that stunning reduced suffering in animals at slaughter when used correctly. I am not trying to say there are never mistakes, there are. Sometime it goes wrong, after all, humans are in the chain of events. But in the vast majority of cases stunning is a welfare friendly act.
This link shows a captive bolt stun (note - stun, not slaughter, the animal is not dead at this point), followed by some un-stunned slaughters. I'd ignore a lot of the writing as this is clearly a video designed to have a huge emotional impact. But have a look for yourself. Probably NSFW, but depends upon your work I guess!
http://www.liveleak.com/view?i=545_1345800806
I can't actually find a video of electrical stunning of cattle, but here is a link to stunning a lamb. Sorry its from the TV, but here you go:
Sorry this has turned out so long, but it is something I really feel strongly about.