Lamb and mouse oocytes were tested with different freezing solutions to see how well they survived and developed after being frozen and then fertilized in a lab. Lamb oocytes did not do well after being frozen, with low survival and development rates compared to unfrozen oocytes. Mouse oocytes, on the other hand, were not affected by the freezing process, but still had lower development rates than unfrozen oocytes. This shows that different animals have different reactions to the freezing process, and it's important to choose the right freezing solutions to help oocytes survive and develop properly.