Factory farming like that is absolutely disgraceful, it's little wonder people try vegetarianism. Still, there are a couple points in that video that struck me as being off.
- Feeding animals before transfer to slaughter would be a waste of food and end up making more mess in the end. You don't stuff a creature with food if you intend to take out on the road or gut it because you don't want to deal with its poop.
- Hanging a chicken upside down for slaughter calms them. Cutting the jugular veins stops blood from going to the brain, knocking them out in one to two seconds.
Then they will flop around like crazy and keep jerking for a while. This reaction is the most disturbing part of humane killing if you don't know what's going on. That's why it's impossible to tell from the video if any of the birds being scalded were still conscious as claimed.
- Chickens gang up and kill weak chickens because that's what chickens do. It's the famous chicken pecking order at work. I'd hesitate to call the chicken on chicken murder happening in factories insanity, though I really do believe it's made worse through overcrowding.
- Pigs that don't grow quickly are sometimes sold for 4H projects instead of being bolted in the brain.
There are people out there that do care for animals and work to make sure they're comfortable and healthy before they make the ultimate sacrifice. It's possible to find humanely produced meats if you're motivated. Here's a couple links.
http://en.wikipedia.org/wiki/Temple_Grandin
This wonderful woman's methods have been adopted by some of the industry for a while now. It makes me wonder where and when the footage in the video came from.
http://sugarmtnfarm.com/blog/index.html
This fellow and his family raise pigs on pasture in Vermont. Letting the pigs be pigs is a big part of his operation, it's quite interesting.
http://www.newagrarian.com/homestead/ducks/
Keeping animals for eggs doesn't have to be painful for the birds.