What color are the scours? If they're a pure or just off-white, this is from rich milk or too much milk, and may be caused by the corn sileage. We tend to see alot of milk scours around here due to the richness of the hay, however the calves adapt almost immediately (couple days) with no treatment at all.
If the scours are bloody, you need to forget about pills and start using Borgal or another registered drug for use on bloody scours.
If the scours are a light to medium green, this is caused by a viral infection of some sort, and the only cure I've found for this is NuFlor. With the wet fall, I was unable to clean my pens adequately, and I've had to treat a couple cases of this. Don't confuse this with the looseness that many calves get when they first get turned out to grass, even though it looks similar.
When giving the electrolytes, mix some Pepto Bismal in with them. This does not help eliminate the scours as some people believe (most scours that people treat are milk scours, which clears up on its own in a couple days), however it does coat the stomach wall and help the calf rest easier.
Rod