The researchers looked at how the quality and size of boar sperm depend on how well the sperm can swim. They studied 393 samples from 33 boars to see if motile sperm had fewer defects. They found that ejaculates with more motile sperm tended to have fewer faulty sperm cells. Some common defects were linked to lower sperm motility. Samples with better sperm motility had slightly bigger sperm. So, ejaculates with higher motility are better for artificial insemination because they have fewer errors in the sperm.