The best way is using an esophageal feeding tube, but I do this and have had lots of practice,
Many people prefer feeding with a bottle, it takes time, and is a pain in the butt
If calves are stealing from cows that have calves already on them it is fine, but if they are stealing from a female that has yet to give birth to her new calf, they are robbing the new calf of its collostrum which the cow does not regenerate, and her calf will have a weakend immune syst. unless suppliment is provided
Keep them separated for a while,
Does this calf's mother not have enough milk?
I would stick to dry product before ever trying dairy, way to risky
There are lots on the market now, there is even a dry IGG product, but to my understanding it comes from plasma from dairy cattle, again with the risk of speading disease, but I don't know if the organism that spreads Jones is viable after the process, I need to look into this more