A calf is a baby cow and a holstein cow is a cow that has not had a baby yet and can not give milk.
Only give Oxytocin when it's necessary, don't give it just because you can. You should really talk to your vet about this, and consider selling off the cow if she can't produce milk for her calf. You'll have to bottle-feed the calf yourself if Oxytocin won't be enough to help the cow give enough milk for her calf. So please, do your animals a favour and talk to your local large animal veterinarian.
A calf doesn't grow in a mother cow's stomach. It grows in her womb or uterus. And cows are fully capable of being able to lactate (give milk) while a fetus is growing in her womb, and it's always to feed the last calf she gave birth to. A cow, however, will eventually stop milk production when her calf is weaned from her several months before she gives birth to her next calf.
When the cow has just had a calf or is suckling a calf.
Cows only give milk if they have a calf. If the cow is not bred, no milk. I think the same for women, so you can't.
you have to have a calf in order to milk a cow
No, cows must be delivered of a calf in order to lactate, or produce milk. Most large dairy farms will remove the calf from the cow right after birth and give it milk replacer, and this will allow the cow to be milked to maximum.
Because it's less work to have a calf-turned adult cow, bull, steer or heifer, forage on its own than to give it milk every day. Besides, the cow that is close to calving can't afford to have milk for both her older offspring and her new calf, so the older calf has to be weaned.
Try to give her a kick-start by giving her a shot of Oxytocin (or an injectible hormone that is similar to encourage milk production) to help encourage her to start producing milk. If that isn't effective, cull her. I hope you are bottle-feeding the calf at this time, because the calf is more important now than the cow.
The most obvious answer is that the calf will die if you don't do something about it immediately. The most immediate answer is that the calf will go hungry and eventually lose its ability to retain the antibodies and immunoglobins if not fed colostrum right away. This will eventually and potentially may be the final nail in the calf's coffin.
Yes, except for a time before it becomes pregnant with another calf.
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.