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Related Experiment Videos

Sperm morphology and preparation method affect bovine embryonic development.

Anneke H Walters1, Willard E Eyestone, Richard G Saacke

  • 1Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg, 24601, USA.

Journal of Andrology
|June 30, 2004
PubMed
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Sperm separation methods significantly impact in vitro fertilization (IVF) outcomes in bulls with abnormal semen. Optimizing sperm preparation and increasing heparin concentration can improve embryonic development, even with morphologically abnormal sperm.

Area of Science:

  • Reproductive Biology
  • Animal Science
  • In Vitro Fertilization

Background:

  • Scrotal insulation in bulls induces heat stress, leading to morphologically abnormal spermatozoa.
  • Sperm quality is crucial for successful in vitro fertilization (IVF) and subsequent embryonic development.
  • Standard sperm separation techniques may be insufficient for preparing compromised semen samples for IVF.

Purpose of the Study:

  • To evaluate the impact of different sperm separation methods (Percoll gradient vs. swim-up) on embryonic development after IVF using semen from heat-stressed bulls.
  • To determine the effect of varying heparin concentrations on IVF outcomes with compromised bull spermatozoa.
  • To identify optimal sperm preparation strategies for improving IVF success rates in artificial insemination programs.

Main Methods:

Related Experiment Videos

  • Semen was collected from Holstein bulls after scrotal insulation; morphologically abnormal samples were cryopreserved.
  • Experiment I: Spermatozoa were separated using Percoll gradient (90%/45%) and swim-up methods.
  • Experiment II: Semen samples were exposed to IVF media with varying heparin concentrations (0.1, 1.0, 10 µg/mL).

Main Results:

  • Sperm separation methods significantly affected blastocyst rates, with Percoll generally outperforming swim-up for control semen but showing limitations with heat-stressed samples.
  • Semen collected later after scrotal insulation (e.g., D+27) resulted in significantly lower or no blastocyst formation.
  • Increased heparin concentration positively correlated with higher embryonic developmental scores, partially mitigating negative effects of abnormal sperm morphology.

Conclusions:

  • Sperm separation techniques critically influence IVF results when using semen with high percentages of abnormal spermatozoa.
  • Current separation methods were inadequate for producing competent sperm for IVF from heat-stressed bulls.
  • Appropriate sperm selection and increased heparin concentrations show potential for improving IVF embryonic development in compromised semen samples.