Kuru is from eating the brains of ancestors.

Mad cow disease was caused because the cow food had extra protein in it which had been heated up high enough to kill the scrapes ...

Then some bright spark ...not ....decided to lower the temperature of the food as it was processed .

The cattle became aggressive .There were lesions in their brains .I called it spongy brain .

Some humans caught it from the meat .....it can take years to start in humans ...

I do not know why they feed protein to the cows ...after the spongy brain started feeding them soya ...