Dietary prebiotic alleviates experimentally induced coccidiosis in broilers.

An experiment was conducted to determine the effects of prebiotic on growth performance and coccidiosis prevention in challenged broilers with Eimeria. A total of 420 1-d-old male Ross 308 chicks were used in a completely randomized design with 7 treatments and 5 replicates with 12 birds in each replication. Dietary treatments were: 1) negative control (without prebiotic and without challenge), 2) positive control (challenged with sporulated oocysts of Eimeria (SOE) without prebiotic), 3) 0.2 % prebiotic in starter, 0.1 % in grower and 0.05 % in finisher challenged with SOE, 4) 0.2 % prebiotic in starter,0.1 % in grower and 0.05 % in finisher without challenge, 5) 0.2 % prebiotic in the whole rearing period challenged with SOE, 6) 0.2 % prebiotic in the whole rearing period without challenge and 7) and Salinomycin (0.05 % of diet). At 7 d of age, treatments were challenged with 20-fold dose of the EIMERIAVAX 4 m as a trivalent live attenuated coccidiosis vaccine. On d 28, intestinal coccidiosis lesions and dropping were scored in the scale of 0-3 and 0-4, respectively, and oocysts per gram feces (OPG) were measured. Prebiotic at either supplementation rate increased body weight gain and improved feed conversion ratio compared with PC group. Challenged broilers fed fixed level of prebiotic displayed lower OPG, dropping scores and coccidiosis lesions scores in upper and middle regions of intestine than PC group, with the effect being similar to unchallenged birds.