Being on a good year-round mineral program helps with herd heath, helps the vaccines to work better, too. I sat in on a veterinarian forum where one of the drug companies was the guest speaker. He spent 45 minutes talking about immune response and how a good mineral program helps the immune system AND helps the vaccines to work the best.
We quit giving anything but Blackleg shots at branding, I think we used Vision 7 for that. Veterinarian said the calves are too young for the other vaccines to provide immunity. So we quit everything but the Blackleg shot and we never noticed one bit of difference. The mineral helped us to have a heathy herd. Very seldom did we have to give anything an antibiotic. Some years we never gave one antibiotic shot. We went through hell with sickness in our calves, 8 years of it. Long story, short, adding a year-round mineral program was the solution.
I'm not saying for those reading this to not vaccinate your calves at branding, but we found we did not need to. Of course, we did give preconditioning shots in the fall.