You'd be suprised at what a dramatic difference a shot of selenium does for calves affected with this. We had a calf go down a couple of years ago when we were driving the herd out to the summer range. He was pretty wobbly, sort of staggered as he went. Anyway, gave him a shot of selenium, and waited. Within twenty minutes he had steadied out and trailed the rest of the way in with no problem. He came home fat and sassy in the fall.
Would be interested in hearing experiences others have had with this.
Word of caution: Be VERY careful when injecting selenium in calves. I lost three calves on branding day last year because my help wasn't paying attention. The shot was given too close to the jugular and within forty minutes of injection, the calves were dead. Apparently if you get it in the jugular, the animal will die within minutes. It was a very costly learning curve for me, and hopefully sharing the experience prevents a wreck like that for others.