so, to a life, it actually makes a difference whether you slit its throat and let its lifeblood drain out.. or you just chop off its head in one blow.
sometimes, i wonder if it is indeed more humane to do certain things that are claimed to be "more humane". but none of them can tell us, can they?
a life is a life, whether you take it away by inserting the poor creature into a grinder alive, or suffocating it, or strangling it; i suspect it makes no difference with regards to the fact that it is dead.
I guess there could be veterinary and medical standards that can give hints to whether one method is quicker and therefore more humane than another and so on, but common, like any multi-billion dollar industry, standards and practices are usually governed by decades of habit as well as what's cheapest and most convenient for the company.
Anyone remember the old days of square holes in cement walls?