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Some "animals" don't have nerve sensors to feel pain. Do you find that so unreasonable? Would you expect a 3-toed sloth to react to stimuli like a cat?
The whole point to Temple Grandin's work has been to be sure cattle DON'T know they are going to die. Cattle are herd animals. You can have them in a huge pen, but they'll probably be all bunched up in a corner. That's when they feel most secure. So Temple Grandin designed a chute that allows the cattle to walk, single file, up to the kill point. They can't see in front of them. They can't see behind them. They only see and feel the cow in front and behind them. There's no blood smell because they're just stunned, not killed at that point. When the cow in front of them is stunned and drops is the first time a cow sees anything. By the time she reacts, she's out like a light, strung up along a conveyor, her throat cut and bled out. She simply never wakes up. The USDA has decreed that's the most humane way to kill cattle for humane slaughter. Stressed cattle that fight in the chute may go down, break a leg and the whole slaughter line has to stop and take care of her. That's not economically a good thing. Meat from stressed animals is often less valuable because of the adrenhlin that flushes through the muscles when they're stressed.
Ellie Krieger, Dietician and host of Food Network’s “Healthy Appetite”, visited a commercial meat packing plant and this is what she said about the slaughter process:
"The last thing I saw was the actual harvest or killing. To be sure, it is not a pleasurable thing to witness in general, but if you eat meat, the simple fact is an animal is sacrificed for your nourishment, a reality we are all too removed from in modern society. The trick is to do it humanely, and this is where I was most impressed. The system Cargill uses was developed in part by Dr. Temple Grandin, the autistic animal scientist who, with her heightened sensitivity, was able to pinpoint specific ways to keep cows stress-free throughout the process (there is an award winning HBO film about her starring Claire Danes.) The whole environment is kept purposefully calm, with no loud noises or bright lights. Before they realize what is going on the cows are hit precisely on the head, given a concussion so they are rendered senseless, then their throats are cut and their blood is drained. The whole thing takes roughly a minute. I watched intently as the cows moved through and noticed no shred of panic or unease."
It's a well written, intersting article. You might want to take time to read it at the link below.