Active immunization with relaxin does not influence objectively determined sperm motility characteristics in rabbits.

@article{Jockenhvel1990ActiveIW,
  title={Active immunization with relaxin does not influence objectively determined sperm motility characteristics in rabbits.},
  author={Friedrich Jockenh{\"o}vel and A Altensell and Eberhard Nieschlag},
  journal={Andrologia},
  year={1990},
  volume={22 2},
  pages={171-8}
}
Two groups of 5 rabbits were actively immunized with porcine relaxin or sham immunized. Serial analysis of sperm motion characteristics using the computer assisted Hamilton-Thorn Motility Analyzer over a period of 22 weeks did not reveal any significant antibody titers in serum and seminal plasma. In consideration of the present findings and after critical review of the literature it is concluded that an influence of relaxin on sperm motility is unlikely.