The effect of dietary SY supplementation on glutathione peroxidase (GPx) and super oxide dismutase (SOD) activity (U/mL) in serum (A, B) and testis (C, D) of goat. * values (mean± SE) differ at p < 0.05 between the groups. The goats in SY were fed 0.3 mg/kg SY while the goats in C did not consumed SY in diet.