Despite being classified as IgG immunoglobulins, the structure of chicken antibodies differs considerably from that of mammalian IgG. Ther are several advantages of this technology over conventional antibody production that uses rabbits and other mammals. Chicken housing isinexpensive, egg collection is noninvasive,and IgY isolation is fast and simple. Another advantage is that very low quantities of antigen are required to obtain high and long IgY titers in the yolk from immunized hens. It is more hygienic than antibody which gets from mammal(such as IgG). Also It responds sensitively to antigen of mammal.
It is safe to exceed administer of antibody without side effect. And it is effective in prevention and treatment on specific disease.