In addition to the importance of homologous transfer of passive immunity between mother and neonate, there is considerable interest in the potential for heterologous transfer of passive immunity, such as immunoglobulins obtained from one species and utilized for passive immunity in another species. The ability to manipulate the immunological status of animals through vaccination against diseases that affect humans and the opportunity to harvest those immunoglobulins in the form of colostrum or milk has long been recognized [19, 20] , and continues to be a topic of interest in both animal science and human medicine [13, 16, 17, [21] [22] [23] .