My husband and I are hand raising holstein heifer calves, and we are having problems with loosing the new born calves anywhere from 5-10 days after we bring them home. They begin to scour 2-3 days after we begin feeding them. The first day we get them we feed them clostirum, then we feed milk replacer, all from a bottle. The first week we give 3/4 of a bottle twice a day, and we gradually work up to full bottle twice a day. We give calf boluses to stop the scouring. We be sure to give clean water twice a day, we put a concrete floor in the barn, and we put lime on the ground out side the barn where the calves graze, but we still have calves that scour. The scours are yellow and very watery. Please help we don't know what to do.