Document Type : Research Paper
Authors
1 Department of Animal Science, College of Agriculture, Shahid Bahonar University, Kerman, Iran.
2 Department of Animal Science, College of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
3 Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
4 Department of Biotechnology, Environmental Sciences Research Institute, Advanced Science and Technology Institute of Environmental Sciences, University of Industrial and Technological Advanced Studies,Kerman,Iran.
Abstract
The aim of this study was to evaluate the efficacy of Bacillus subtilis bacteria capable to produce phytase enzyme on improving broiler chicken performance and to evaluate its effect on gastrointestinal organs, and tibia strength in broiler chickens. This experiment was done using 200 one-day old broiler chicks (Ross 308), in a completely randomized design with 5 treatments, 4 replicates and 10 chicks per replicate for 42 days. The treatments include: 1) positive control diet containing sufficient phosphorus level; 2) negative control diet with 30% less phosphorus; 3) negative control diet supplemented with phytase enzyme; 4) negative control diet supplemented with a commercial probiotic; 5) negative control diet supplemented with Bacillus subtilis SH17-3. Feeding broiler chickens with a diet containing Bacillus subtilis bacteriaSH17-3 significantly reduced feed intake and mean body weight gain (BWG) in the total rearing period (P<0.05). Feeding broiler chickens with a diet containing phytase enzyme significantly increased feed intake and BWG (P<0.05). The strength of tibia was significantly increased in birds received phytase enzyme, compared to other groups (P<0.05). Based on the results the use of phytase enzyme in diets with phosphorus deficiency, improves performance in broilers; but Bacillus subtilis bacteria SH 17-3 could not be a good alternative for probiotic and also phytase enzyme.
Keywords
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