Researchers studied different methods of freezing bovine oocytes to preserve their quality. They compared conventional freezing, ultrarapid freezing, and vitrification. After thawing, vitrified oocytes showed higher rates of normal morphology and cumulus expansion. Vitrified oocytes also had higher rates of in vitro maturation, fertilization, and cleavage compared to oocytes frozen using other methods. Overall, the study found that vitrified oocytes had less severe injuries, making them a promising option for preserving bovine oocytes.