Photos of a calf drinking milk from a cow are fairly easy to find. Most stock photo sites would have some pictures of calves nursing from their mothers. They can also be found in books about farms and farm animals.
All mammals including kangaroos breast feed their young.
Hamas (Swan)
by drinking mama milk from the female cow .
I saw a baby calf drinking the milk of her mother cow.
This will depend if she is at her peak of lactation, when the calf is drinking the most milk, therefore she is producing more. In this case she can be still producing milk for 3 or even 5 months after that. However, if the calf is nearing weaning age (about 10 months), than the cow might be producing milk for about 2 months. This will change from cow to cow depending on how well they produce milk, heavy milkers will produce longer than light milkers.
When the cow has just had a calf or is suckling a calf.
No.
you have to have a calf in order to milk a cow
Calf milk poweder is for baby cows that, for some reason, can not nurse from there mother. Calf milk powder is the same to a cow as formula is to an infant.
When she gives birth to a calf.
Yes.
A cow nurses it's babies much the same as a human. she has an utter, filled with milk that the calf sucks on to get milk. A cow nurses it's babies much the same as a human. she has an utter, filled with milk that the calf sucks on to get milk.
What breed is the cow? What size is the calf? How old is the calf? These are all factors that determine whether the calf is full enough drinking from two quarters, or whether the other two quarters may be infected with mastitis and the cow won't let the calf suckle the other two quarters; or the calf's just a newborn and/or is a small calf, and the cow is producing too much milk for such a small calf.
It depends. Is she a beef cow or dairy cow? Are you wanting to keep the cow with the calf or separating the calf from the cow? Usually with beef cows you don't bother with milking them unless you have to because the calf isn't up and suckling soon after birth and you want to encourage the calf to be up and suckling, or to get some milk from a cow or heifer that won't accept her calf right away to feed that calf with. With dairy cows, though, if you've separated the calf from the cow right away, it's ideal to milk that cow to collect the colostrum to feed that calf--and other calves--to the benefit of the calf's health. But, if you are wanting to keep the calf with the cow for a couple of days, then no, it's not necessary.