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Boar sperm motility activation by bicarbonate remains stable despite storage duration. This suggests qualitative sperm function is preserved even as overall motility declines during liquid preservation.

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Area of Science:

  • Animal Reproduction
  • Sperm Biology
  • Cryopreservation

Background:

  • Liquid preservation of boar spermatozoa reduces fertilizing ability, a decline not well-indicated by standard semen parameters.
  • Molecular effectors like bicarbonate offer a more sensitive method to assess storage-induced changes in sperm function.
  • Bicarbonate is crucial for sperm capacitation and motility activation, processes occurring naturally during ejaculation and oviductal transit.

Purpose of the Study:

  • To investigate if the response of boar sperm subpopulations to bicarbonate, measured by motility activation, is affected by in vitro storage duration.
  • To assess the stability of sperm subpopulations under different storage conditions and their response to a key motility activator.

Main Methods:

  • Boar spermatozoa were stored in Beltsville thawing solution at 17°C for up to 72 hours.
  • Sperm motility responses to bicarbonate were analyzed using computer-aided sperm analysis after Percoll gradient separation at 12, 24, and 72 hours.
  • Sperm subpopulations were identified through cluster analysis of motility data in bicarbonate-containing and control media.

Main Results:

  • Standard semen parameters showed minimal changes over 72 hours of storage.
  • Five distinct sperm subpopulations with differing motility characteristics were identified.
  • Bicarbonate consistently induced a significant increase in the 'fast linear' sperm subpopulation, irrespective of storage duration (66.4% at 12h vs. 63.9% at 72h).

Conclusions:

  • Boar sperm motility exhibits a dual response pattern to storage: quantitative motility declines, while qualitative motility (bicarbonate-stimulated fast linear motion) is maintained.
  • The ability of bicarbonate to activate specific sperm subpopulations remains robust despite extended liquid storage.
  • This suggests that certain aspects of sperm function crucial for fertilization may be preserved longer than indicated by traditional semen analysis.