饲粮添加抗菌肽对蛋鸡生产性能、蛋品质及血清生化指标的影响OA

This experiment was conducted to investigate the effects of dietary antimicrobial peptides(AMPs)on production performance,egg quality and serum biochemical indexes of laying hens in late laying period(50 weeks of age).A total of 448 Hy-Line Brown laying hens were randomly divided into 4 groups with 7 replicates in each group and 16 hens in each replicate.The basal diet was supplemented with 0(control),250,500 and 750 mg/kg AMPs,respectively.The pre-test period was 10 days and the formal trial period was 56 days.The results showed that compared with the control group:① AMPs had no significant effect on laying rate,average egg weight,average daily feed intake and unqualified egg rate(P>0.05);the feed-egg ratio of the 500 mg/kg and 750 mg/kg AMPs supplementation groups was significantly decreased(P<0.05),and the feed-egg ratio showed a significant linear and quadratic relationship with AMPs supplementation level(P<0.05).② On the 56th day,compared with the control group,the eggshell brightness value of the 750 mg/kg AMPs group was significantly decreased(P<0.05),while the eggshell thickness and eggshell strength were significantly increased(P<0.05);the eggshell brightness value,eggshell strength and eggshell thickness showed a signifi-cant linear and quadratic relationship with AMPs supplementation level(P<0.05).③ AMPs had no significant effects on total protein,albumin,alanine aminotransferase(ALT),alkaline phosphatase and uric acid(P>0.05);compared with the control group,the serum cholesterol content of the 250 mg/kg AMPs supplementation group was significantly decreased(P<0.05),and the serum cholesterol content showed a significant quadratic relationship with AMPs supplementation level(P<0.05);compared with the control group,the serum glucose content of the 750 mg/kg AMPs supplementation group was significantly decreased(P<0.05);the serum urea nitrogen content of each AMPs supplementation group was significantly decreased(P<0.05),and the serum glucose and urea nitrogen contents showed a significant linear and quadratic rela-tionship with AMPs supplementation level(P<0.05).It can be seen that dietary supplementation of AMPs can improve the production performance,egg quality and regulate serum biochemical indexes of laying hens in the late laying period,and the optimal AMPs supplementation level was 750 mg/kg under the experimen-tal conditions.