In theory the method used in non-halal slughter is far more humane. A bolt to the brain causing instant unconsciousness, rather than being hung upside down and having its throat slit. However much pain the animal may or may not feel after the windpipe is cut it still experiences fear and stress for several seconds after, possibly longer, and the process of having its throat cut can be very painful.
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When both carotid arteries are severed, sheep will lose sensibility within 2 to 14 seconds (Newhook and Blackmore 1982, Gregory and Wotton 1984, Nangeroni and Kennett 1963, Schulz et al 1978, Blackmore 1984). Most sheep will be insensible within 10 seconds. Calves and cattle take a longer period of time to become insensible and they are more likely to have a prolonged period of insensibility. The time to loss of insensibility when good cutting technique is used will range from 17 sec to 85 sec (Blackmore 1984, Blackmore et al 1983l, Gregory and Wotton, 1984, Grandin 2010, Daly et al 1988, Gregory et al 2010). Some cattle may have prolonged periods of sensibility lasting up to 385 seconds (Blackmore, 1984). When good technique is used the average time to collapse is 17 seconds (Grandin 2910). Both scientific research and practical experience indicate that cattle have more problelms with prolonged periods of sensibility compared to sheep.
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http://www.grandin.com/ritual/welfar...ep.cattle.html
But: the bolt isn't always effective, so in some instances the animal isn't insensible at the point of slaughter. In such cases it's hard to argue that it is more humane.
Done properly, non-halal slaughter is a less stressful end for the animal. It's been designed that way, partly under pressure for more humane treatment of animals, and partly because stress hormones affect the quality and taste of the meat.
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with blood flowing out the body can help to prevent diseases and germs which is in the blood, which means healthier meat.
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No evidence for this whatsoever. It's based on a medieval understanding of the body.