牛乳铁蛋白对蛋鸡生产性能的影响OA

To investigate the effects of bovine lactoferrin on the productive performance and egg quality of laying hens,a total of 28-week-old Hy-Line Brown commercial laying hens were selected and randomly divided into 4 groups with 25 birds per group.Group 1 served as the control group,which was fed only a self-prepared basal diet;Groups 2,3 and 4 were the ex-perimental groups,supplemented with 300,400 and 500 mg/kg of bovine lactoferrin in the basal diet,respectively.The pre-liminary trial lasted for 7 days,followed by a 42-day formal trial.The results showed that compared with Group 1,the average egg weight and average laying rate of laying hens in Groups 3 and 4 were significantly increased(P＜0.05),whereas no signifi-cant differences were found between these two groups and Group 2.The average daily feed intake of laying hens in Groups 2,3 and 4 was significantly lower than that in Group 1(P＜0.05).In terms of the feed-to-egg ratio,there was no significant difference between Group 3 and Group 4,but both were significantly lower than those in Group 1 and Group 2(P＜0.05).No significant differences were observed in yolk color and eggshell thickness among all treatment groups.However,in terms of numerical values,dietary supplementation with bovine lactoferrin could improve yolk color to a certain extent,and this improvement was positively correlated with the addition level of bovine lactoferrin.In conclusion,different levels of bovine lactoferrin exerted differential effects on improving the productive performance and egg quality of laying hens.Specifically,Group 3(supple-mented with 400 mg/kg bovine lactoferrin)exhibited the optimal productive performance,while Group 4(supplemented with 500 mg/kg bovine lactoferrin)achieved the best egg quality.