کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5804740 | 1555711 | 2012 | 10 صفحه PDF | دانلود رایگان |

We evaluated the effects of dietary supplementation with different preparations of probiotics on the performance of broiler chickens experimentally infected with 2Â ÃÂ 104 sporulated oocysts of Eimeria tenella at 14Â days of age. Three hundred, day-old, Cobb-500 chicks, as hatched, were separated into 10 equal groups with three replicates. Two of the groups, one challenged with E. tenella oocysts and the other not, were given a basal diet and served as controls without medication. The other challenged groups were given the anticoccidial lasalocid (60Â mg/kg) or Enterococcus faecium (5Â ÃÂ 108 or 5Â ÃÂ 109Â cfu/kg feed), Bifidobacterium animalis (5Â ÃÂ 108Â cfu/kg feed), Lactobacillus reuteri (5Â ÃÂ 108Â cfu/kg feed), Bacillus subtilis (5Â ÃÂ 108Â cfu/kg feed), or a multi-species probiotic mix at 5Â ÃÂ 108 or 5Â ÃÂ 109Â cfu/kg feed, respectively. The trial lasted 6Â weeks. Individual body weight, feed intake per pen and feed conversion ratio values were recorded weekly, along with the extent of bloody diarrhea, excreta oocyst numbers and bird mortality. Caecal lesions were assessed and intestinal samples were taken for histopathological and bacteriological evaluation from ileum and caecum. Overall growth performance of chickens fed the multi-species probiotic mix at both levels was higher (PÂ <Â 0.05) compared to the infected control. Overall oocyst shedding was lowest (PÂ <Â 0.05) in the lasalocid supplemented group. Villous height was higher (PÂ <Â 0.05) in Bacillus supplemented groups compared to infected controls. The Lactobacillus supplemented group had the highest (PÂ <Â 0.05) numbers of both Lactobacillus and Bifidobacterium in ileum and caecum. In conclusion, dietary probiotics are promising for further investigation on improving intestinal health and growth performance of broiler chickens experimentally challenged with E. tenella.
Journal: Veterinary Parasitology - Volume 188, Issues 1â2, 13 August 2012, Pages 31-40