a decreasing trendP<0.05
Furthermore, with the addition levels of TB in feed, the relative expression of CAT, protein kinase B (Akt), heme oxygenase 1 (HO-1), phosphoinositide 3-kinase (PI3K) and GPx were increased with increasing dietary TB supplementation level up to 0.06% ( P<0.05 ), and thereafter showed a decreasing trend, while, the highest expression levels of copper and zinc superoxide dismutase (Cu/Zn-SOD) was observed in 0.09% TB supplementation in feed ( P<0.05 ) ( Figure 4 ).