Feeding effect assessment of three medicinal plants and their compounds for triploid crucian carp(No.3)
To clarify the feeding values of medicinal plants,juvenile triploid crucian carps(No.3)were randomly divided into five groups and fed with basic feed(control group)and feeds supplemented with 4%Portulaca oleracea L.,4%Plantago asiatica L.,4%Houttuynia cordata Thunb.and 4%coumpounds(Portulaca oleracea L.∶Plantago asiatica L.∶Houttuynia cordata Thunb.=1∶1∶3)for 85 days.The results showed that compared with the control group,Portulac-a oleracea L.and Plantago asiatica L.significantly increased the relative weight gain rate and specific growth rate of fish(P＜0.05),and significantly reduced the feed coefficient(P＜0.05).Houttuynia cordata Thunb.slightly reduced the specific growth rate and slightly increased the feed coefficient,but the difference was not significant(P＜0.05).Portulaca oleracea L.significantly increased the content of crude protein and significantly decreased the content of crude fat(P＜0.05),while Plantago asiatica L.significantly decreased the content of crude protein and signifi-cantly increased the content of crude fat(P＜0.05).Portulaca oleracea L.,Houttuynia cordata Thunb.and compounds could significantly reduce the activities of alanine aminotransferase(ALT)and aspartate aminotransferase(AST),the con-tents of malondialdehyde(MDA),total cholesterol(TC)and total triglyceride(TG)in liver(P＜0.05),significantly en-hance the activities of superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)in liver(P＜0.05),and im-prove the structure of liver tissue.Portulaca oleracea L.significantly improved the midgut villus structure,while Houttuynia cordata Thunb.made the midgut villus structure worse.In summary,under the 4%addition level,the feeding value of Por-tulaca oleracea L.was the highest,followed by Plantago asiatica L.and compounds,and then Houttuynia cordata Thunb.
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