The only way to get milk is for a female cow to have a baby. And like all mammals the mother produces milk for the young. Then the baby will be taken away at birth so that we can get the milk that was meant for a baby. It's still a baby, so it still needs milk. That's where we come in. We have to bottle feed it, so give it a bottle full of milk.
The above is for dairy calves. For beef calves, baby orphan calves that cannot be grafted onto another mother must be fed milk to help them grow. Calves' stomachs, when born, are like a monogastric's stomach and the rumen doesn't start developing until around 4 weeks (30 to 35 days) of age. Milk is the only source of protein and energy that calves need to survive and grow on efficiently.
Milk, and a feed called Calf Starter (or some similar name), which is a formulated feed meant for feeding growing bottle calves.
Then you gotta bottle feed the calf yourself until you can get the cow to accept her calf.
3 months
Depends on how old the calf is, but milk replacer mixed with water is what you can feed a baby calf. Also allow it access to hay or grass, grain, and water.
Bottle feed
No. They drink out of a much larger bottle specifically made for raising baby calves, typically called a calf bottle.
no
Yes
you dont have to feed it. It like feeds itself but you have tou have a bottle kit.
No. You feed it breastmilk through your nipple. Alternatively, you can feed it from a bottle.
This depends on when you first put the calf on the bottle. But mainly, it'll be a few months that a calf goes from being dependent on the bottle to being fed as a feeder calf.
Being extinct, they don't eat anything.