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TORONTO (AP) — Another 650 head of cattle will be destroyed for testing as Canadian investigators try to eliminate any suspicion that mad cow disease exists beyond a lone infected cow, officials said Wednesday.

Tests on 192 animals from the most recent herd of the infected cow came back negative, and further tests involve cattle from farms that received calves born from the most recent herd or where the infected cow lived over the years before it was slaughtered in January, said Brian Evans, chief veterinary officer for the Canadian Food Inspection Agency.

Among the cattle being euthanized for testing of their brains are about 600 from three farms in Alberta and Saskatchewan, along with 49 from another Saskatchewan farm where the infected cow is believed to have lived for four years, Evans said.

Initial test results were negative from one farm where some of the 75 calves from the most recent herd of the infected cow were sold, Evans said.

With further results pending, he said one of the 17 herds under quarantine in the investigation will be removed from the list.

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