Effects of Antimicrobial Peptides Extract on Laying Performance, Egg Quality, Serum Biochemical Parameters and Intestinal Microflora of Laying Hens

The objective of this experiment was to study th e effects of different dietary antimicrobial peptides(AMPs) extract level on the laying performance,egg quality,serum biochemical parameters and intestinal microflora of laying hens.Four hundred and eighty 210-day-old Hisex hens were randomly divided into four groups with four replicates and thirty hens per replicate.One group received the basal diet as a control,while others received the basal diet supplemented with 200,400,600 mg/kg AMPs extract as treatments.The results showed that,compared with the control group,200 mg/kg AMPs extract significantly increased the egg yolk weight percentage(P 0.05) and decreased the numbers of Escherichia coli(P0.05),but had no significant effect on other indexes(P0.05).200 mg/kg AMPs extract significantly increased the laying rate and egg yolk weight percentage(P0.05),reduced the concentration of albumin and glucose(P 0.05),and decreased the numbers of Escherichia coli in the ileum(P 0.05).600 mg/kg AMPs extract significantly increased the content of serum SOD(P0.05),but had no significant effect on other indexes(P 0.05).In conclusion,the optimal addition of AMPs extract to the diets for laying hens would be 400 mg/kg.