Effects of different levels of rosemary extracts on growth performance,serum biochemical indices and immune organ indices of Yellow-feathered Broilers
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
NETL
NSTL
万方数据
