The content of immunoglobulins in colostrum and milk is highly dependent on the animal species [1, 14] . The same holds for the relative proportion of the immunoglobulin classes. These species differences are adaptations to the reproductive strategies of the animals and the degree of maturation of the offspring at birth. Animal species may be divided into three classes [1] : (1) species where immunoglobulins are transferred mainly to the fetus via the placenta (humans and rabbits);