Dairy cattle are usually able to produce milk for about 7-9 years, this may vary between each cow. Many factors are present to determine how long a cow can produce milk such as, genetic structure, longevity, birth weights of calves born by the cow, and conformation.
No, don't give them cow's milk.
200,000
Depends on the size of the glass...
No.
Meat and milk.
just about 200,000 glasses
yes!
they give milk
evaporated milk
It depends on the breed of cow in question. A Holstein (dairy) cow will give more milk than a buffalo, but a Charolais (beef) cow will give less milk than a buffalo does. An Angus cow may give as much or slightly more milk than a buffalo cow will.
For as long as it lives, which is, for the average dairy cow, around 7 years.
Because milk is white. the colour of the cow is irrelevent to the colour of the milk