When being weaned, it'll be a few days that cows and calves will be crying for each other.
As long as the cow thinks it is necessary to hide that calf. Usually a cow will hide her calf for a week or two after birth until the calf is strong enough to be up, running and playing with the other calves.
A cow is a mature female bovine that has had a calf. She was a heifer before she had her first or second calf.
The name of a baby cow is a Calf
A cow that has NEVER had a calf in her lifetime is called a Heifer. A cow that has not had a calf YET is a heavily pregnant or heavy-bred, or a short-bred or long-bred cow. A cow that has not had a calf during a calving season is called a barren cow, an open cow, a cystic cow, a cull cow, a meat/slaughter cow, a poor cow, a free-loader, etc.
The baby is called a calf and mother is a cow. Together they are called a cow-calf pair, or "mom and baby."
Cow. Calf came after.
A "calf".
A newborn calf, a baby calf or just a calf.
The best thing you can do is to skin the dead calf of that beef cow's, and drape it over the orphan calf's body so that you trick the cow into thinking that that calf is hers. But this will only work if you have that cow's dead calf on hand and not if that cow doesn't have a calf or if you're wanting to put another calf on that cow. Other tricks include smearing cod liver oil or perfume or some other strong-smelling solution that's not poisonous to the cow nor calf over the cow's nose and all over the back and head of the calf, putting a dog in with the cow and the calf, etc.
A young cow, in the sense of it being female, is called a heifer. Heifers remain so until they have had a calf. However in the more general sense, a young "cow" is called a calf.
A cow and calf should not be separated unless you are weaning them. Thus, if you are asking about weaning a cow from her calf and vice versa, you should keep them separate for at least 6 to 8 weeks, longer if the calf tries to go back to suckling his momma again when you put them back together.
The offspring of a cow is referred to as a calf. A heifer calf is a female calf, a bull calf is an intact male calf, and a steer calf is a castrated male calf (castrated after birth).