I believe it should be controlled.
I live in Sweden and a friend of mine is doing a PhD at the agricultural university. She tests things like the effect of different diets on pigs. They feed the pigs for a while and then kill them to analyze the effects inside their bodies.
Every time they kill the pigs they have to get official permission, and there are inspectors which check the quality of living of the pigs... they need a certain amount of living space, a fairly hygienic and comfortable environment (for example, temperature wise), etc. And obviously there are procedures for the actual killing.
It's always sad to kill animals but we have to do it, in order to live the way we do. We should just have some standards.
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