I listened to this article some time ago, and went back to it after receiving an e-mail from a friend about the treatment of cattle.
Excerpt: Do cattle know they are walking to their deaths [when slaughtered using her methods]? Ms Grandin thinks they do not. They behave in exactly the same way when they walk up the curved chute to get vaccinated. Some get agitated, but most just trot through. In her view, properly performed slaughter is less cruel than a more natural death at the jaws of wolves.