even though the Large animal vet is a long way off, you need to cultivate a professional relation ship with him/her. If you are buying animals, you will need drugs, you will need services. 70-80 miles is a pain but in the long run the gains will far our weigh in the way of treatment advice, vaccine advice and the purchase of drugs.
If your vet is that far away, you might want to think to have a few things on hand for when a calf goes down.
Our vet has also sent us home with the glycerin treatment. The idea is to get the stomach working again, restoring the PH (been so long since i used it.) We have tubed with it and put it in the cow's water to drink free choice.
Next, you might want to consider the cost of the treatments and if it is worth it. This calf might just be a PI calf that will always show signs of sickness when stressed. If it is a PI calf you also need to consider the cross contamination to the other calves who are understress from shipping and what not.
If it is a PI calf, the calf will shed the viruses when it is sick and when it is healthy. If it is PI viruses can not be treated, it has to run it's course, and you then treat to prevent secondary infections like pnemonia, shipping fever, scours etc. You can get the calf tested for BVD and IBR which are the cause of a PI (persistantly infected) calf. I think for BVD you need a small chunck of the ear for a test.
A good vaccination program from the sellers would be a good idea especially if you have no vet to speak of.
Also, remember, when the doctor gives you anti biotics, it's for 7-14 days depending on the severity of the illness. So, one or two shots just will not cut it. If you do not get all the bacteria, you will have a relapse, and a chronic lunger will develope.
Finally, if you have cows to calve, make sure they are no where near these bought calves. If there is a PI one in the bunch, you will spread the disease to the unborn calf if the cow has not been vaccinated with ML FP vaccines. Cross contamination can occur from any hole in the calf's body. This includes the crapper, the mouth, the nose, the eyes. So that means no shared food, no shared water and separate sick pen...a must for a feed lot operator...which is what you are if you are buying feeders to raise...even if it is just one.
Good luck and keep us posted on the progress