| Green tea powder,a by-product from tea production,can be used as feed additive in animal rearing to improve the immunity and meat quality in animals.In this research,a certain proportion of green tea powder was added as additive to evaluate the growth performance,carcass rate,meat quality and intestinal microflora in broilers.A total of 596 healthy AA broilers at 1 d were selected and randomly divided into 6 groups,with 6 replicates in each group,and 16 birds per replicate.Group I fed basal diet,group II fed basal diet + antibiotics(0.0004%),Group III fed basal diet +0.5% green tea powder,group IV fed basal diet +1% green tea powder,group fed basal diet +2% green ?tea powder,Group VI fed basal diet + antibiotics(0.0004%)+1% green tea powder.On d 14 and d 28,one bird from each replicate was slaughtered for intestinal microflora incubation.On d 42,2 birds from each replicate were slaughtered for carcass rate,meat quality,and intestinal microflora determination.Growth performance,meat quality and carcass trait were analyzed by ANOVA analysis using SPSS17.0.Proc GLM was used for microflora comparison between tissue and group.Broilers in group III weighted for 138.4g at 7 d of age,which was significantly lower than that of control group.The body weight in group?and group ?was significantly higher than that of control group at 14 d of age(P<0.05).The body weight in group III,group IV and group?was significantly lower than that of the control group at 21 d of age.Broilers body weight exhibited no significant difference among groups after 21 d of age.The carcass weight,carcass rate and abdominal fat rate exhibited no significant difference among the groups.The half-eviscerated weight and eviscerated weight of the cock from group ?was 1694 g and 1461 g,respectively,which significantly lower than that of group?.In female birds,the breast muscle weight was higher in group as compared to ?group?,and the eviscerated weight was higher in group ?as compared to group?(P<0.05).The meat color of a*(red)value in breast muscle from group IV and was higher,and ?the shear force was lower,as compared to control group(P<0.05).Total fat content(IMF)was 14.90% in group IV,which was significantly higher than that of group I(10.68%).The breast(dry sample)total content was 3.93% to 4.84%,which were significantly higher than that of control group(1.44% to 1.77%)(P<0.05).The leg IMP content from birds in group II was significantly higher than that of group VI.The breast IMP exhibited no difference between male and female birds.In male birds,the breast muscle Calcium content was 0.09mg/g in group IV,which was significantly lower than that of group I.In female birds,the breast muscle Calcium content was 0.07mg/g in group IV,which was significantly lower than that of group III(P<0.05).The microflora of E.coli,Salmonella and Bifidobacterium from ileum of birds at 14 d of age exhibited no difference among groups.Lactobacillus in group IV and group V of birds at 14 d of age was 5.85 log CFU/g and 5.90 log CFU/g,respectively,which was significantly higher than that of control group(P<0.05).The microflora from ceca exhibited no difference.Escherichia coli and Salmonella from ileum of birds at 28 d of age was lowest in group ?.Lactobacillus from ileum of birds at group IV and group V was 5.81 log CFU/g and 5.85 log CFU/g,respectively,which was significantly higher than that of control group(P<0.05).E.coli from ileum of birds at 42 d of age at group III,group IV and group V lower than that of control group.Lactobacilli from ileum of birds at 42 d of age was significantly higher than that of the control group.E.coli was significantly lower than that of control group.Lactobacillus and Bifidobacterium was significantly higher than that of control group(P<0.05).Green tea powder addition decreased body weight,improved leg ratio in male broilers and breast ratio in female broilers.As to meat quality,green tea powder addition reduced shear force,calcium and IMP content,improved meat color of a* value and IMF content.Green tea powder addition promoted the growth of Lactobacillus and bifidobacteria,and inhibited the proliferation of Escherichia coli and salmonella in the ileum and ceca of broilers. |
PDF Full Text Request