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Ejaculated boar spermatozoa displaying a rare multivesicular defect.

Szabolcs Nagy1, Tuire Tamminen2, Magnus Andersson2

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Summary
This summary is machine-generated.

A novel sperm defect in boar studs involves surface particles, decreasing with age. These particles are phospholipid vesicles, indicating a post-epididymal defect with a good prognosis.

Keywords:
CLSMExosomesPigSemen morphologyTEM

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Area of Science:

  • Veterinary Science
  • Reproductive Biology
  • Animal Breeding

Background:

  • A novel sperm defect has been observed in boar studs in Finland.
  • This defect affects sperm morphology and potentially fertility.

Purpose of the Study:

  • To characterize a previously unreported sperm defect in boars.
  • To investigate the nature and origin of the observed sperm surface particles.

Main Methods:

  • Semen samples from affected boars were analyzed using eosin-nigrosin staining and phase contrast microscopy.
  • Transmission electron microscopy was employed to examine the ultrastructure of the sperm surface particles.
  • Spermatozoa were fixed with formaldehyde before examination.

Main Results:

  • Spermatozoa exhibited small particles on their surface, with prevalence decreasing in older boars.
  • Particles were observed on spermatozoa classified as dead cells post-fixation.
  • Transmission electron microscopy identified these particles as multivesicular and multilamellar vesicles composed of phospholipid membranes.

Conclusions:

  • The condition is classified as a post-epididymal multivesicular sperm defect.
  • The defect has a favorable prognosis, suggesting limited long-term impact on affected boars.
  • Understanding this defect is crucial for boar stud management and reproductive efficiency.