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From the Contra Costa Times:

The federal government has decided to kill 450 quarantined calves from a Washington state herd that includes the offspring of the animal found to have the nation's first known case of mad cow disease.
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Officials said the herd will be destroyed because they were unable to determine which young bull was the offspring of the diseased cow.
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Officials know the diseased mother's calf is about six weeks old and living on a Sunnyside, Wash., feedlot, but they have not found records that would identify which of the 450 animals it is.

I don't know about you, but that doesn't speak well of their record keeping. And why can't they do DNA testing to find out which one it was? Or, for that matter, test all 450 of them for BSE?