I purchased a bottle of B-Complex vitamins from the Vet supply. It shows 1-2 ml /500 lb body wt. for adult cattle and 1-2 ml for calves.For those of you that use them, what situations do you feel it is helpful to give a shot of B-Complex vitamins? I was thinking of using it if I get a weak calf that I need to give colostrum or electolytes to. Also when do you feel it is helpful to give a dose of probios. I also bought a tube of that to keep on hand.