The inherent immune system of adult animals such as cows is an amazing system that normally does a good job of keeping adults from getting sick. While nature has done a good job for adults, newborn and young animals such as calves have a harder time dealing with enteric conditions such as scours since their inherent immune system has not formed yet or is only partially formed. Nature deals with this problem in newborn calves whereby a preformed antibody in the mother’s colostrum milk is given to the calves. This is called passive immunity, and occurs when preformed antibodies from one animal are given to another animal to protect that other animal from diseases. But one
issue that nature has not fully dealt with is the type and amounts of specific antibodies that can be
delivered to a newborn calf.