Advancements in cryopreserving pig embryos have been made since 1997. Researchers have developed new methods to freeze and thaw pig embryos successfully, leading to the birth of live piglets from frozen embryos. They have also discovered that intracellular lipids play a role in the sensitivity of pig embryos to cold temperatures. By stabilizing the cell structure and using a technique called vitrification, researchers have been able to improve the success rate of embryo transfer. New technology like open pulled straws has made the process more efficient. These findings suggest that cryopreservation of pig embryos could be a valuable tool for pig production and preserving genetic resources for the future.