Effect of perilla frutescens extract on immunity function of broilers
This experiment was designed to study the change of immunity function of broilers adding the perilla frutescens extract to diets.Single factor trial design was used in our experiment.Four hundred fifty one-day-old avian broilers were randomly allocated to five groups with three replicates of thirty broilers each.They were fed a basal diet 0.05mg/kg aureomycin 0.5g/ kg,1.0g/kg and 1.5g/kg perilla frutescens,respectively.The experiment period was divided into two stages,0-3rd week and 4th-6th week.The effect of perilla frutescens extract on immune function of broilers was studied at the end of 3th week old and 6th week old.The results showed:(1) Comparing with control group,the rate of survival of broilers from 0.5g/kg and 1.0g/kg groups was raised during 4th-6th week or whole experiment period.The rate of survival of broilers from 1.5g/kg group was higher than the control group during the whole experiment period.(2)Comparing with control group,the immune organs index,ND antibody,the rate of erthr ocyte active rosette,T lymphocyte rate and serum IgG in 0.5g/kg,1.0g/kg and 1.5g/kg groups were all raised.(3)The effect of perilla frutescens extract is better than that of aureomycin on improving the immunity function of broilers.We concluded that perilla frutescens extract could improve immunity function of broilers.The effect of adding 1.0g/kg perilla frutescens extract in broilers diet was better than other doses.Perilla frutescens extract will be potential substitute for antibiotics.