Effect of time (start at hatch or start at 4 week-old until 40 week-old) and level (A: No supplementation, B and C: Supplementation at 0.5% and 1% of the total diet composition, respectively, starting at 4 week-old until 40 week-old and D: Supplementation at 1% of the total diet composition starting at hatch until 40 week-old) of GSE dietary supplementation on Total Antioxidant Status (TAS), Total Oxidant Status (TOS) and Oxidative Stress Index (OSI) in hens plasma.

Results are presented as lsmeans ± SEM. P values of the effects of the stage when the supplementation is applied (TimeSuppl) and diet were considered as significant if P < 0.05. Different individual letters (a, b and c) in superscript indicate a significant effect of the diet.