The Central Nervous System: the brain and spinal cord.
At this point, only one cow is known to be affected by Mad Cow Disease in the latest case (which was in April of 2012). The other cows from the same herd as the one known to be affected will be tested for the disease as well.
Nobody really knows.
The people who raise cattle, of course.
The brain.
Both are just likely to be affected as the other.
The central nervous tissues as well as the spinal cord are affected by this. It has been shown that almost all tissues are affected before death.
There is no such thing as "cow disease" unless you are referring to MAD cow disease, which is something else entirely.
It's not sad cow disease, it's MAD cow disease. Its a brain disease that can cause irrational behavior in cows.
The U.K. (in c.1987), as well as Canada (most notably that lone case in 2003...)
There are many functions and structures in a cows anus. This is to help the animal to excrete waste.
Bovine spongiform encephalopathy (BSE, the scientific name for mad cow disease) is caused by a prion, a normal protein that is mis-folded and cannot be broken down by the body.
We are aware of mad cow disease