Step 1 : Introduction to the question "7. What did people feed cows which spread the 'mad cow disease'?"
...1. Chocolate 2. Fellow cows 3. Peanut butter 4. Spinach Cows aren't supposed to be carnivore-cannibals, as they are herbivores. The causative organism of BSE (bovine spongiform encephalopathy, or 'mad cow disease') can be found in most parts of a cow's body, but is most easily transmitted in the nervous tissue.