IgG (immunoglobulin G) is an antibody produced by the mother llama/alpaca in her udder towards the end of her pregnancy and passed to her cria in the very first milk - the thick, sticky colostrum. The maternal first milk is so very important due to the fact that the IgG content of the first milking is double that of the second milking. Since the newborn cria has no immune system of its own, it is most important that the cria first nurse during the first six hours after birth and get an adequate amount of colostrum. As each hour passes, the stomach becomes less porous and the ability for the cria to absorb the colostrum lessens. If the cria does not obtain an adequate passive transfer of antibodies from his mother, he will be at great risk to any infectious disease within the first few months of his life until he is mature enough to manufacture his own IgG. It is recommended that a simple blood sample be taken 24 hours after birth to check the IgG level to assure that the passive transfer of antibodies was adequate. A minimal level of 800 is marginal.