关键词: 戊糖片球菌, 微胶囊, 肉仔鸡, 生产性能, 免疫器官指数

Abstract: [Objective] This research concentrated on screening the optimum embedding conditions of Pediococcus pentosaceus microcapsule and their effects on the production performance and immune organ index of broilers.[Method] P. pentosaceus was screened from the cecum of an adult Caoke chicken raised in the free-range system (numbered CGMCC No.6566).The optimum embedding condition was selected,by the L9 (33⁴) orthogonal test and statistical analysis,and the tolerance of the microcapsule products in the simulated gastric fluid,enteric solubility and storage stability were detected.120healthy 1-day-old AA broilers were randomly divided into 2groups with 3replicates.Then the P. pentosaceus microcapsule (1g per kilogram feed) was added in the basal diet of the trial group for 6weeks and the control group was fed only with basal diet.[Results] ① P. pentosaceus microcapsule embedding yield reaches 80.44%,and the products had good resistance to simulated gastric fluid environment.Products also have good enteric solubility and can be stable at room temperature (20℃).② Broiler weight gain rate (13.36%),breast muscle rate (15.58%) and thigh muscle rate (11.07%) in the trial group were significantly increased compared to the control group.Besides,a higher feed conversion ratio (6.07%) was detected from the birds with P. pentosaceus microcapsule products supplied than those without probiotic supplement.There were no significant differences in thymus,spleen and bursa of Fabricius index between the trial group and the control group.[Conclusion] P. pentosaceus microcapsule product has a positive probiotic effect on broiler's growth and meat perfcrmance.

Key words: Pediococcus pentosaceus, microcapsule, broiler, production performance, immune or-gan index