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Alpha-tocopherol improves biochemical and dynamic parameters in cryopreserved boar semen
Elizabeth Breininger1, Norma B Beorlegui, Cristián M O'Flaherty
1Area of Biochemistry, School of Veterinary Sciences, University of Buenos Aires, Chorroarín 280, C1427CWO Buenos Aires, Argentina. ebreininger@fvet.uba.ar
Theriogenology
|April 14, 2005
Summary
Adding alpha-tocopherol (vitamin E) to boar semen extender improves sperm quality after cryopreservation. A concentration of 200 µg/mL effectively protected sperm motility and reduced oxidative damage.
Area of Science:
- Reproductive Biology
- Animal Science
- Biochemistry
Background:
- Cryopreservation induces oxidative stress in sperm, leading to lipid peroxidation and reduced sperm quality.
- Reactive oxygen species generated during cryopreservation damage sperm membranes.
Purpose of the Study:
- To determine the optimal alpha-tocopherol concentration for improving cryopreserved boar semen quality.
- To evaluate the protective effects of alpha-tocopherol against cryopreservation-induced oxidative stress in boar spermatozoa.
Main Methods:
- Boar spermatozoa were cryopreserved with varying concentrations of alpha-tocopherol (200, 500, 1000 µg/mL).
- Post-thaw semen quality parameters, lipid peroxidation (TBARS), and oxygen uptake were assessed after incubation.
- Sperm motility, viability, and acrosome integrity were evaluated.
Main Results:
- Sperm motility was significantly higher in alpha-tocopherol treated groups up to 2 hours post-thaw.
- 200 µg/mL alpha-tocopherol protected against lipid peroxidation, while 1000 µg/mL was less effective after 2 hours.
- A negative correlation between TBARS and motility indicated lipid peroxidation's impact on sperm function.
- Sperm's oxidative energy generation capacity was maintained longer with 200 µg/mL alpha-tocopherol.
Conclusions:
- Supplementation with 200 µg/mL alpha-tocopherol in semen extenders can enhance boar sperm quality post-cryopreservation.
- Alpha-tocopherol mitigates oxidative stress and lipid peroxidation, preserving sperm motility and function.