You can consider weaning the calf when it's 6 months of age or more. How long after she's bred that you can wean the calf off her depends on how long after she calved you had her bred. If you had her bred about three and a half months (~80 days) after she calved, then you should consider weaning the calf two-and-a-half to three months after she's been bred.
A cow will often make it's calf stop nursing by the time it's around 10 months of age. Most producers have the calves stop earlier though, like around 3 to 6 months of age, to prevent the calf from "pulling down" his mother any more than she needs to be before she calves again.
Disease or a blockage in the gut will cause a calf to stop eating. This is something you need to take up with your local large animal veterinarian immediately if you wish to have a hope of saving the calf.
First make sure if the calf is indeed nursing from the wrong cow. Then separate the calf and his mother into a different pen or pasture and let them stay in there for a few weeks. Make sure it's just the pair that's in there and there's no other cows in there with them that the calf may decide to latch onto.
She stopped nursing in 1897.
when their done nursing. it's obvious.
Groundhogs usually stop nursing and are on their own at five or six weeks of age.
about 8 months
6 months
It'll go a lot quicker if you get in there and pull the calf out as fast as possible. Backwards calves, in most cases if you see it happening, should be pulled ASAP. Don't wait for the cow to do it, because it the calf has no space to breath if the cow decides to stop pushing and take a rest. You MUST get that calf out immediately so it can live and breath, otherwise you will end up with a stillborn calf on your hands.
No because if they did the babies they are nursing would most likely die of starvation.
A good calf massage will releave the discomfort.
At around 5 years old.