Hayray,
I am new to this forum....and I don't usually join these types of things, but I saw your question for help, and I hope this can help you and your calf.
Bottom line up front. If your calf is still alive and you are bottle/tubing it, you can probably still save it and get it's momma to take it back.
First, pen the momma and calf up together. The idea here is that they will have little to no contact with other cattle and will begin to bond. Second, ensure there is free choice hay and clean water. Next, inspect the calf closely for any possible injury or oral infection. If your calf was stepped on during birth, it could have sustained an injury to its mouth/tongue, thus preventing it from being able to latch on and nurse. If this is the case, I recommend that you take it to a vet for a further analysis and diagnosis.
If everything physically apears to be normal, continue with the following. Start with 1/2-1 quart of MR using a bottle. If the calf refuses to suck, or is too weak to suck, tube the calf. Follow up with a second feeding approx 6 hrs later with another 1/2 quart of MR. Then that evening feed another 1/2-1 quart of MR. This should allow the stress of the calf to subside a little. Plus it will sleep well with a full tummy. Then, the following morning, provide some range cubes or sweet feed for momma. While momma is enjoying her little treat, get the calf up and under momma. The calf should be good and hungry come morning. If the calf is still too weak, don't give up. Keep trying. I have used this before and seen a calf finally graft after three weeks. Just try to keep in mind, that real young calves nurse quite often. Therefore, if possible try to feed slightly small amounts, but broke up into three feedings rather than two. I hope this doesn't reach you too late. Good Luck!!
1_TXRancher