Why is mad cow disease called that? Well it is because the cows who obtained it were really mad when they were running from the butchers.
The mad running caused the cows to get infected before they were killed, then the meat was sold without any inspection for disease since the butchers were too greedy for the money.
It is no wonder the disease has spread like mad over in Britain itself, it is also no wonder loads in Europe were mad about the fact that mad cow disease existed in Britain and thus refused to buy British beef, which really hurt the British beef industry.