The aim of this experiment was to investigate the effects of Rosmarinus officinalis extract(ROE)on growth performance,serum biochemical indices and immune organ indices of broilers.A total of 720 broilers(all female)of 35-day-old with similar body weights were randomly divided into 6 groups with 6 replicates per group and 20 broilers per replicate.The broilers in the control group were fed a basal diet,and those in 5 experimental groups were fed the basal diets supplemented with 100,200,300,400 and 500 mg/kg ROE,respectively.The pre-test period was 7 days and the experimental period was 21 days.The results showed as follows:1)Compared with the control group,dietary 100 to 500 mg/kg ROE had no significant effects on the FBW,ADG,F/G,mortality rate and immune organ index of broilers(P＞0.05),but had a tendency to reduce the ADFI of broilers(0.05＜P＜0.10).2)Compared with control group,dietary with 200～500 mg/kg ROE significantly increased the serum UREA content of broilers(P＜0.05),dietary 100 to 300 mg/kg ROE significantly increased the serum TC content of broilers(P＜0.01),and dietary 100 to 500 mg/kg ROE had no significant effects on the contents of TG,TP,GLU,CREA and the activities of ALP,AST and ALT in serum of broilers(P＞0.05).In conclusion,dietary with 100 mg/kg ROE could significantly increase the serum TC content and decrease the ADFI of broilers,which indicates that ROE has the potential to be used as a feed additive for medium-speed broilers.
rosmarinus officinalis extractbroilersgrowth performanceserum biochemical indeximmune organ index
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