Ram sperm in action (IMAGE) KTH, Royal Institute of Technology Caption On the day of the ewe’s ovulation, the ram sperm can penetrate the cervical mucus. Credit Xavier Druart Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.