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Seminal plasma addition attenuates the dilution effect in bovine sperm
D L Garner1, C A Thomas, C G Gravance
1School of Veterinary Medicine, University of Nevada, Reno 89503, USA.
Theriogenology
|July 27, 2001
Summary
Adding seminal plasma to diluted bovine semen improves post-thaw sperm viability, especially at low sperm concentrations. This finding is crucial for optimizing cryopreservation protocols for bull semen.
Area of Science:
- Reproductive Biology
- Animal Science
- Sperm Cryopreservation
Background:
- Semen dilution to low cell numbers can reduce post-thaw viability of cryopreserved bovine spermatozoa.
- Essential seminal plasma components may be lacking at higher dilution rates, negatively impacting sperm survival.
Purpose of the Study:
- To investigate the effect of adding seminal plasma on the post-thaw viability of cryopreserved bovine spermatozoa at various dilution rates.
- To determine if seminal plasma can mitigate the negative effects of high semen dilution on sperm quality.
Main Methods:
- Bovine ejaculates were diluted to different sperm concentrations (120 to 4 x 10^6 sperm/mL) in an egg yolk citrate extender.
- Split samples were treated with or without added seminal plasma (+SP and -SP).
- Sperm viability was assessed using SYBR-14/propidium iodide and JC-1/propidium iodide staining.
Main Results:
- Significantly higher proportions of viable spermatozoa were observed in samples with added seminal plasma (+SP) compared to those without (-SP).
- Sperm viability decreased significantly with decreasing sperm concentration in -SP samples.
- +SP samples showed a less pronounced dilution effect on sperm viability compared to -SP samples.
Conclusions:
- Addition of seminal plasma can enhance sperm viability in cryopreserved bovine semen diluted to low cell numbers.
- Seminal plasma appears to contain components that protect spermatozoa during cryopreservation and dilution.
- These findings support the supplementation of seminal plasma in semen extenders for improved cryopreservation outcomes.
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