The U.S. Department of Agriculture says a possible third case of mad cow disease has been discovered by British and American labs.

USDA Chief Veterinarian John Clifford says, "The suspect animal, which was destroyed after having trouble giving birth in April, produced an inconclusive result in an initial round of testing for the brain-wasting disease

After two years, the border between Canada and the U.S. has been opened to cattle trade.

Concerns over mad cow disease caused the border to be closed until Canada's agriculture minister announced a truck carrying cattle was transported to the U.S

After two years, the border between Canada and the U.S. has been opened to cattle trade.

Concerns over mad cow disease caused the border to be closed until Canada's agriculture minister announced a truck carrying cattle was transported to the U.S

The National Veterinary Service Laboratory in Ames, Iowa, tested two groups of cows, 77 total, from a herd in an anonymous ranch in Texas that surfaced an animal infected with mad cow disease; all of the cows tested negative.

Investigators are trying to identify offspring and herd mates born within a year of the infected cow's birth

According to the U.S. Department of Agriculture (USDA) thirty-eight more cattle from the Texas ranch where a beef cow recently confirmed to have mad cow disease, have been tested.

The results were all negative, for the presence of mad cow disease, and acording to the USDA, no further testing on those animals is planned