Apr 17, 2007

Seasonal variations in antioxidant enzyme activity in ram seminal plasma

Theriogenology
E MartiJosé A Cebrián-Pérez

Abstract

Seminal oxidative stress status is emerging as a significant prognostic tool in assisted reproductive technology. A dynamic interplay between pro- and anti-antioxidant substances in the ejaculate is essential. In this study, we determined seasonal changes in the activity of the antioxidant enzyme defense system comprising superoxide dismutase (SOD), glutathione reductase (GR), glutathione peroxidase (GPx) and catalase (CAT) in seminal plasma (SP) of mature Rasa Aragonesa rams. This breed corresponds to a local Spanish genotype with a short seasonal anoestrus between May and July. In addition, the activity of these enzymes was measured in protein fractions isolated from ram SP by exclusion chromatography. Total protein content in ram SP was higher during the breeding season (October-February) with a significantly higher value in first ejaculates. Antioxidant enzyme activities were higher during the non-breeding season (March-September). Comparing first and second ejaculates, SOD and CAT activities were higher in the first of all months. However, GR and GPx activities changed throughout the year. Thus, GR activity was higher in July and August in first ejaculates, this difference being significant in July (4.53 versus 2.37 nmol s...Continue Reading

  • References75
  • Citations27

References

  • References75
  • Citations27

Citations

Mentioned in this Paper

Fertility
Establishment and Maintenance of Localization
Seminal Fluid
Manganese Superoxide Dismutase
Xanthine
RASA1 wt Allele
Andrology
Nevus
Enzymes, antithrombotic
Talpidae

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