We have a four week old holstein bull calf who first had scours. They went away, now he's beginning to get very weak-won't stand unless assisted but eats calf starter and alfalfa like its going out of style ONLY when he's up so this is roughly twice a day for about two hours at a time. Then he either lays down or falls down and stays there until someone can help him up again. Any ideas on what could be causing his demise? The vet won't be able to come out until Sunday afternoon so I'd appreciate any opinions in the mean time!