Donkey embryos were frozen using two methods: slow freezing and vitrification. The researchers studied how well these embryos survived after being thawed and grown in the lab. They found that the survival rate of the embryos was not affected by how they were frozen but by their stage of development. Early-stage embryos had better survival rates than fully developed ones. The quality of the embryos was also affected by the freezing methods, with slow freezing resulting in higher-quality embryos. In conclusion, both slow freezing and vitrification had similar survival rates for donkey embryos, but slow freezing produced higher-quality embryos when grown in the lab. This research shows that different freezing methods can impact the quality of frozen embryos.