SEW pigs have only gamma globulin obtained from colostrum milk, because they are incapable of producing gamma globulin for 1 to 2 weeks postweaning. Porcine plasma protein has been extremely valuable in SEW programs, as it is rich in IG as well as amino acids and the pattern of amino acids closely aligns to the needs of pigs. The IG immune competence of porcine plasma protein would reflect the microbial environment of the pigs that were processed in the packing plant at the time the blood was collected. Although not perfect for the microbes in the SEW facilities, the pattern would reflect many of the same organisms and provide immune protection.
Eggs also are extremely rich in IG and contain a valuable source of amino acids.
Egg protein is the standard to which all other dietary proteins are compared. The IG in eggs would have an immune material capable of reacting in the microbial environment of SEW units for pigs. The IG in egg is extremely critical to the survival and early growth of young chickens and could potentially provide protection in pigs. Plasma protein has the greatest influence in SEW programs during the first week to 10 days postweaning. Work done in this laboratory demonstrates the value of plasma protein during the first week postweaning and also demonstrates justification for reducing plasma protein beyond 7 days postweaning.