Sperm sexing in cows affects how sperm interact with the cow's oviduct, potentially lowering fertility by 25%. To understand this, researchers used advanced imaging techniques to examine the differences between sexed and regular sperm. They found that sexed sperm have trouble binding in the oviduct, showing deformities in the head and tail, with more debris on their surface. The oviduct's ciliated cells don't recognize sexed sperm like regular sperm. Additionally, sexed sperm have reduced calcium levels that impact their ability to move effectively. Overall, sexed sperm struggle to form a proper reservoir in the oviduct, have impaired motility due to tail deformities, and may have difficulty reaching and fertilizing the egg.