To investigate the effects of dietary peony seed shell on fish oxidation resistance and nonspecific immunity,yellow catfish were fed with 1%or 5%peony seed shell(commercial feed containing 1%or 5%peony seed shell)for 3 weeks.Meanwhile,fish fed with commercial feed only were used as the blank control group,and fish fed with 1%or 5%peony seed oil were used as positive con-trol group.The results showed that,compared with blank control group,the activity of superoxide dismutase(P<0.001)and the con-tent of complement C3(P<0.05)in serum of fish fed with 1%peony seed shell increased significantly.Liver superoxide dismutase and catalase activities were higher than those of the blank control group(P<0.001),and liver malondialdehyde content decreased signifi-cantly(P<0.001).Liver histomorphology of yellow catfish was normal and intact in both the blank control group and 1%peony seed shell group,and there was no obvious difference between the two groups.Peony seed shell had a dose-dependent positive effect on pro-moting the antioxidant capacity and nonspecific immunity in yellow catfish,all the test indexes in the 5%peony seed shell group showed a remarkably better change.Compared with blank control group,serum superoxide dismutase,liver superoxide dismutase and catalase activities in 5%peony seed shell group increased by 100%(P<0.001),245%(P<0.001)and 176%(P<0.001),respective-ly.Serum lysozyme activity and complement C3 content increased by 36%(P<0.001)and 33%(P<0.01),respectively.In both dose groups,peony seed shell showed similar positive effects on yellow catfish compared to peony seed oil,the suitable addition amount was 1%～5%.
维普
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