WASHINGTON -- The Agriculture Department said today that 29 cows tested negative for mad cow disease after they were culled from the same herd where an infected cow had been found. Official said tests of another 38 cows from the herd are pending.
Investigators have been working to identify offspring and herd mates born within a year of the infected cow's birth. The infected cow was a 12-year-old Brahma cross beef cow.
The department said 29 adult cows were removed from the herd on Wednesday. They were taken to a collection site and euthanized, and tissue samples were removed for testing. The department said today that those 29 adult cows tested negative, according to the National Veterinary Service Laboratory in Ames, Iowa.
The department said samples from an additional 38 cows received Friday are pending.