Wow... so much incorrect information in such a small space.
First, CJD is caused by prions which can come from several sources including your own body if you're unlucky enough to have the wrong genetic mutation.
Second, the prion that causes Bovine spongiform encephalopathy cannot be destroyed by any level of pasteurization that would leave cattle feed in an edible state. It remains viable at temperatures below 600 degrees C. Trying to pasteurize cattle feed at that temperature would incinerate it and leave you with prion-laden ashes. Changes to regulations on the pasteurization of cattle feed would have no effect whatsoever on this.
Third, the outbreaks of BSE were caused by cattle feed containing the remains of sick cattle and sheep. At the time, it was seen as a way to minimize lost profits while disposing of sick animals, so it rapidly became a wide-spread practice which resulted in the huge outbreaks of the dease.