Effect of zinc bacitracin and phytase on growth performance,nutrient digestibility,carcass and meat traits of broilers |
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| Authors: | Y A Attia F Bovera A E Abd El‐Hamid A E Tag El‐Din M A Al‐Harthi A S El‐Shafy |
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| Affiliation: | 1. Arid Land Agriculture Department, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia;2. Department of Veterinary Medicine and Animal Science, University of Napoli Federico II, Napoli, Italy;3. Department of Animal and Poultry Production, Faculty of Agriculture, Damanhour University, Damanhour, Egypt |
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| Abstract: | A total of 336 one‐day‐old Hubbard broiler chickens were randomly distributed among 8 groups, each containing six replicates (7 chickens/replicate). From 1 to 40 days of age, the groups fed the same starter, grower and finisher diets. The control group was unsupplemented; zinc bacitracin (ZnB) group received the antibiotic at 0.5 g/kg; fungal phytase (FP) groups received 250, 500 and 1000 U/kg diet of Aspergillus niger phytase (FP_250, FP_500 and FP_1000 groups), respectively; bacterial phyatse (BP) groups received 250, 500 and 1000 U/kg diet of Escherichia coli phytase (BP_250EP, BP_500EP and BP_1000EP groups) respectively. Considering the whole experimental period, body weight gain was unaffected by ZnB and different concentrations of bacterial and fungal phytase; however, the feed conversion ratio of the group fed a diet supplemented with 500 U of BP was better (p < 0.01) than those fed with a diet supplemented with 500 U of FP. BP_250 group had a higher (p < 0.05) apparent digestibility of ether extract compared to FP_250 group. In conclusion, bacterial phytase at 500 U may enhance performance of broiler chickens fed during days 1–40 of age and yield similar growth performance and economic efficiency to those of eB‐supplemented groups. |
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| Keywords: | broilers growth performance zinc bacitracin phytase |
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