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Related Concept Videos

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Ejaculated compared with epididymal stallion sperm vitrification.

C Álvarez1, N González2, V Luño2

  • 1Military Horse Breeding Center in Zaragoza, Spain.

Animal Reproduction Science
|December 2, 2019
PubMed
Summary
This summary is machine-generated.

Vitrifying epididymal stallion sperm with trehalose offers superior motility compared to lactose or conventional freezing. However, ejaculated sperm showed reduced viability after vitrification, suggesting trehalose is best for epididymal samples.

Keywords:
CryopreservationSemenStallionSucroseTrehaloseVitrification

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Area of Science:

  • Reproductive Biology
  • Cryopreservation Science
  • Animal Science

Background:

  • Stallion sperm cryopreservation is crucial for genetic preservation and artificial insemination.
  • Vitrification offers potential advantages over conventional freezing for sperm preservation.
  • Extenders like trehalose and lactose are investigated to improve cryosurvival rates.

Purpose of the Study:

  • To compare the efficacy of trehalose and lactose as extenders for vitrifying ejaculated and epididymal stallion sperm.
  • To evaluate the impact of vitrification on sperm motility, viability, and acrosome integrity.
  • To determine the optimal extender for long-term storage of valuable stallion sperm.

Main Methods:

  • Semen was collected from stallions (ejaculated) and epididymides (epididymal).
  • Samples were diluted with INRA 96®, BSA, and either trehalose or lactose, then vitrified in liquid nitrogen.
  • Control groups underwent conventional freezing.
  • Post-thaw assessment included motility (computer-assisted), viability (SYBR-14/PI), and acrosome integrity (FITC-PNA/PI).

Main Results:

  • Vitrification of epididymal sperm with trehalose (EPT) or lactose (EPL) yielded higher progressive motility than the control (EPC).
  • EPT demonstrated significantly greater sperm motility (50.72%) post-devitrification compared to EPL (34.21%).
  • Vitrified ejaculated sperm showed significantly lower viability and motility than the conventional frozen control (EJC).

Conclusions:

  • Trehalose-based vitrification is a promising alternative for long-term storage of epididymal stallion sperm.
  • Vitrification of ejaculated stallion sperm resulted in reduced motility and viability compared to conventional freezing.
  • Further research may optimize vitrification protocols for ejaculated sperm to enhance cryosurvival.