Why not just supplement with colostrum?
Transfer Factors are non-allergenic whereas colostrum contains many antibodies, large milk proteins designed for the calf primarily casein and immunoglobulins that can cause allergic reactions to many people. In other words, Transfer Factor is not species-specific it is identical in all mammals. Colostrum also contains only random amounts of Transfer Factors, so you would have to take about 75 times the amount to get the same result. You would have to take up to 75 capsules of colostrum to equal the power of just one capsule of Transfer Factor Plus!