Effect of Nonenzymatic Antioxidants on Sperm Motility and Survival Relative to Free Radicals and Antioxidant Enzymes of Chilled-Stored Ram Semen

Moustafa M. Zeitoun^1*, Mona A. Al-Damegh²

¹Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Buriedah, KSA.
²Department of Biology, College of Sciences and Arts, Qassim University, Oniza, KSA.

DOI: 10.4236/ojas.2015.51007                

Abstract

The effect of inclusion of three antioxidants (Vitamin E, cysteine and glutathione) in ram semen extender on the release of antioxidant enzymes and free radicals was studied. A 3 × 3 factorial experiment was conducted to test effects of supplementing ram semen extender with Vitamin E (1, 5 and 10 IU), cysteine (1, 5 and 10 mM) or glutathione (0.5, 1 and 2 mM) on the sperm survival and release of superoxide dismutase (SOD), glutathione peroxidase (GPX) and thiobarbituric acid reactive substances (TBARS). Eighty ejaculates of eight fertile Najdi rams were collected, assessed for the gross examination and the good ejaculates (≥90% motility) were pooled and sperm count was assessed. Therefore ten extenders; control (C) and 9 treated (C plus antioxidant) were tested. Extended semen was stored at 5°C for 96 h, examined for motility and survival and sperm cells were separated from plasma, sonicated, homogenized and exposed to the determinations of SOD, GPX and TBARS. The highest sperm survival was found in diluents containing 5 IU Vitamin E/ml, 1 and 2 mM glutathione (55.5% survival), while the lowest survival was found in 10 mM cysteine (11.1%). TBARS concentration was highest (P < 0.05) in control than other treatments, however, Vitamin E and glutathione exhibited low values. Contrariwise, activities of SOD and GPX increased (P < 0.05) within sperm cells and seminal plasma in diluents containing 5 IU E, 1 mM and 2 mM glutathione. The enzymatic activities were generally higher in seminal plasma than in sperm cells. It was concluded that supplementing ram semen extender during chilled storage with 5 IU Vitamin E per ml or 1 - 2 mM glutathione enhanced sperm survival and reduced free radicals.

Keywords

Ram, Semen Storage, Free Radicals, Antioxidant Enzymes

Conflicts of Interest

The authors declare no conflicts of interest.

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