Hopefully never. You should never give a cow rabies, if you can help it.
Beef and Dairy products.
A dairy cow.
A cow. Or, if you want to go into specifics, a dairy cow.
No. Contact with the dead animal is necessary, usually with its saliva. (And, of course, the animal has to have been already infected with rabies. Contact with a non-infected dead animal will not give you rabies.)
Yes, when they are to old to breed and the milk production drops off they are eaten. Smaller (family) dairies usually care more about their cows and will sometimes give a cow a year off if she is normally a good milker, but eventually she will have to be replaced by a younger cow. On occasion a favored cow may be turned out to field and retained as a farm pet or mascot. That is if it is a small grass based dairy and not a confinement dairy operation.
It gives more milk than what it would normally produce for its calf. That's what constitutes a cow for being a dairy cow.
Dairy
The dairy cow.
That all depends on the breed. Are you asking about a dairy cow or a beef cow, and what breed of dairy or beef cow?
Dairy cattle like Holsteins, Brown Swiss and Jerseys.
For as long as it lives, which is, for the average dairy cow, around 7 years.
A dairy cow would die a matter of a few weeks before she even gets to the point where she is deemed "feral." I would see a beef cow becoming feral, yes, but not a dairy cow.