well to tell you the truth you call it a newborn calf
There are different variables as to why. First of all, I hope the calf was born alive. It could've been that it tore the birth canal opening as his head emerged. This can happen if the calf is either big or has a big head.
A newborn calf, a baby calf or just a calf.
Cows have ALWAYS been a calf when they were younger. There is no animal that has never BEEN a youngster before, EVER. Heifers are females that have never HAD a calf, not never BEEN a calf. Cows are females that have been calves when they were born; bulls are males that have been calves when they were younger, so were steers and oxen. They just grew out of their need for their mother's protection and milk. Simple as that.
A baby giraffe is called a calf just like a baby cow.
A baby elephant is called a calf.Elephants are named just like cows and whales:male - bullfemale - cowbaby - calf.
Yes, otherwise it would just sink and die.
The possessive form for the singular noun calf is calf's (just as you have it in your question).
When the cow has just had a calf or is suckling a calf.
The calf's rumen doesn't become fully functional until it is around 3 to 4 months of age. From birth until this time the rumen is underdeveloped and in the growing and developing stages. It is present when the calf is born, just not as fully functional as with a bovine that has been weaned and on forages alone or fully matured.
A calf should be at least 3 months of age before you can deworm it.
You treat according to what illness the calf has. You can't treat a calf just to treat a calf, there has to be a reason you're treating it.
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.