After four years of research and trials, the PRIT has successfully generated transgenic pigs harboring a foreign lactoferrin gene. Now, lactoferrin levels are maintained at a high level in the milk for the full 28-day lactation period. The gene has been retained through four generations thus far.
養豬研究所經過四年的研究、嘗試，已經成功培育出含外源性豬乳鐵蛋白基因的母豬，在二十八天的泌乳期間，豬乳鐵蛋白含量皆維持在高標準，現在到第四代都還存在此一基因。