Influence of dietary selenium yeast (SY) supplementation on glutathione peroxidase (GSH-Px) activity in ruminal epithelium of goats. Goats were fed basal diet without SY supplementation (C, n=5) and Basal diet + SY supplementation @ 0.3 mg.Se.kg-1.diet (SY, n=5) for 8 weeks. Values (mean ± SE) differ at P < 0.05.