Now, we all know that Apollo 13's slingshot trajectory around the moon carried the august crew of that storied ship further from Earth than any other human beings have ever been. However, the ancient nursery rhyme assures us that the cow jumped over the moon. Looking into the physics of bovine space-travel trajectories, it appears to me that the smaller mass of the cow as opposed to the Apollo13 CSM-LM combo would require a closer pass over the lunar surface. Assuming that expulsion of intestinal gasses from the cow (properly timed) would impart sufficient thrust for her to achieve trans-Earth injection, the nearer pass over the lunar surface would be required to counteract her lesser mass relative to Apollo 13 for her to gain full benefit from the gravitational slingshot effect. Am I right or what?