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USDA kills 29 herdmates of Texas BSE animal 
by Pete Hisey on 7/11/2005 for 
The government has euthanized and is testing 29 cattle that were herdmates of the beef cow that tested positive for bovine spongiform encephalopathy last month.
All 29 will be tested using the Bio-Rad Elisa rapid test, and if any positive results are indicated, the animals will be subjected to more advanced testing using both the immunohistochemistry (IHC) and Western blot tests. USDA did not say how many of the animals are offspring of the infected cow and how many were born at roughly the same time as that animal.
Authorities are also investigating the feed history of the affected animals. The infected animal, which was delivered dead to a pet food renderer in Waco, Texas, was 12 years old and therefore was born well before the imposition of a ruminant-to-ruminant feed ban in 1997, and therefore could have become infected before the ban was put in place.